Omar, son of al-Khattab, has converted to Islam and wants everyone to know quickly.
So he goes to see a man called Jamil, son of Ma'mar al-Jumahi, who was "renowned for the speed with which he passed on secrets. If he was told anything in confidence, he let everyone know about it immediately."
Omar says: "I have become a Muslim. Do not say anything. Keep it dark. Do not mention it in front of anyone."
Jamil walks straight out into the street and starts shouting: "Do you believe that Omar, son of al-Khattab, has not become a Muslim? Well, do not believe that! I am telling you that he has!"
The news went everywhere. "And that was just what he intended."1
The whole operation is a selection decision. Omar does not craft anything, phrase anything cleverly, or persuade anyone of anything. He picks a person.
And the person he picks is chosen for a property that is publicly known and completely reliable: Jamil breaks confidences, fast, every time.
That is what makes this different from ordinary rumour-spreading. Omar is not hoping the news travels. He is using a transmission device with a documented failure mode, in exactly the way you would use a machine — and the failure mode is the feature.
Notice also that Omar's message needs no engineering because Jamil's own excitement supplies the force. The version that reaches the street is louder and more emphatic than anything Omar could have said himself: do not believe that — I am telling you that he has. The instrument amplifies.
Keep it dark. Do not mention it in front of anyone.
That sentence is doing three separate jobs, and the third is the one worth having.
It makes the information a secret, which raises its value in transmission — a fact given freely travels slower than a fact given in confidence.
It gives Jamil something to do. He is not being asked to spread news; he is being asked to hold it, which is the one thing he cannot do, so his own compulsion supplies the energy.
And it gives Omar complete deniability with no falsehood in it. He asked for silence. It is on the record that he asked for silence. Anyone reconstructing the event later finds a man who tried to keep something quiet and was betrayed by a known gossip.
The instruction is not a cover story bolted on. It is the mechanism and the alibi at once.
Greene's second case is the strategic therapist Milton Erickson, and it runs the same structure inside a marriage.
A wife wants therapy; the husband "absolutely refused" it. Rather than working on the man directly, Erickson would see the wife alone and, as she talked, "interject interpretations of the husband's behavior that he knew would rile the husband up if he heard them. Sure enough, the wife would tell her husband what the doctor had said. After a few weeks the husband would be so furious he would insist on joining his wife in the sessions so he could set the doctor straight."2
Same three parts. A known transmitter — a wife who will repeat what her therapist said about her husband. A payload selected for its effect on the final recipient, not on the carrier. And a target who arrives under his own steam, angry, insisting on something the operator wanted.
The husband is not tricked into therapy. He demands it. And his demand is the correct response to what he was told, which was accurate — Erickson's interpretations were presumably his real ones.
Check both cases for lies.
Omar had converted. Jamil shouted a true thing. The crowd received a true thing.
Erickson's interpretations were his professional readings, delivered to his patient in session, which is where interpretations belong. The wife repeated them accurately. The husband was correctly informed about what his wife's therapist thought of him.
Greene's own general rule mentions "false or planted information" as though the two were interchangeable.3 The cases show they are not, and the true version is strictly better.
A false plant can be checked and, if checked, destroys the operator. A true plant delivered through a known transmitter cannot be caught by verification at all, because verification returns yes, that is what he said. The only thing hidden is the routing, and routing is not the sort of thing anybody thinks to audit.
Which means the technique's real material is not content. It is topology — knowing who talks to whom, how fast, and under what conditions.
There is something a particular person needs to know and you cannot be the one to tell them.
Maybe it would sound like a complaint. Maybe it would sound like a boast. Maybe the two of you have a history that would colour anything you said, so the fact would arrive wearing your motive.
Now stop thinking about the sentence and start thinking about the room. Who talks to them? Not who reports to them — who chats to them. Every organisation has two or three people whose function, unofficially, is circulation, and everybody knows who they are, and nobody writes it down.
Watch yourself as you land on the name. There will be a small satisfaction, and it is worth interrogating, because it is the same satisfaction whether the fact is true and useful or true and destructive. The mechanism does not care which, and neither, in that moment, do you.
Then the phrasing, and this is where it becomes something. There is a version where you say the thing plainly and let it travel. And there is a version where you say between us — and the second one moves faster, sticks harder, and gives you an alibi.
That word is the whole ethical hinge of the technique. Saying a true thing to someone who will repeat it is ordinary human communication. Saying it prefaced by a request for confidence you know will not be honoured is a deliberate falsification of your own role in the event, and the fact you delivered is still true.
If you find yourself reaching for between us, you have stopped informing someone and started operating a machine.
The instrument in both cases is safe in a way that no other cat's-paw in this law is safe.
Jamil is not harmed. He does the thing he always does, is not blamed for it because everyone already knew he would, and suffers nothing. The wife is not harmed; she reports her therapist's views to her husband, which is a normal thing for a person in therapy to do.
Compare de Orco on the flagstones, or Ts'ao Ts'ao's commissariat chief, or Chiang Kai-shek's army absorbing artillery. Those instruments are consumed.
The difference is that information transmission costs the transmitter nothing. Which is why this variant is repeatable where the others are not — Omar could use Jamil again, and Erickson presumably ran the same manoeuvre for years.
The chapter never notices that its cheapest technique is also its only renewable one.
The general rule: "The easiest and most effective way to use a cat's-paw is often to plant information with him that he will then spread to your primary target. False or planted information is a powerful tool, especially if spread by a dupe whom no one suspects. You will find it very easy to play innocent and disguise yourself as the source."3
A dupe whom no one suspects is the operative phrase, and it is slightly wrong about why it works. Nobody suspects Jamil of anything — but not because he is above suspicion. Because there is nothing to suspect him of. He is not concealing a role; he has no role. He is a known feature of the environment behaving exactly as known.
The best transmitter is not the one nobody suspects. It is the one whose behaviour is so predictable that it reads as weather.
Attribution is unusually good on the Omar case and absent on the Erickson one. The Omar anecdote is a marginal, sourced in the text to The Subtle Ruse: The Book of Arabic Wisdom and Guile, thirteenth century — named work, named era.1 The Erickson passage names no case, no date, no publication, and describes a habitual practice.2 Once again the marginal is better sourced than the body it decorates.
🚩 SINGLE SOURCE on Erickson. Erickson is used across five separate laws in this book to prove five different things, always without citation. This is the corpus-wide pattern of one practitioner recruited repeatedly and never referenced.
🚩 An ethical claim is passed over. Erickson's method involves saying things to a patient because of their predicted effect on a third party who will hear them. Whether the interpretations were also his honest clinical readings is exactly the question, and Greene does not raise it. The case is presented as technique.
Open question. The technique's requirement is a known transmitter. What happens in an environment where everything already circulates unattributed — is planting still possible, or does it require a network with legible, distinct channels?
The chapter's other instruments are spent; this one is not. Set the two side by side and a rule falls out that Greene never states.
A cat's-paw is consumed in proportion to what the task costs it. De Orco's task cost him a province's hatred, and he was disposed of before he could turn it into a problem. Chiang's army absorbed artillery. Weil's intermediary spent his own credibility with his boss.
Jamil spends nothing. The task is a thing he was going to do anyway.
So the durable form of the technique is the one where the instrument's action is already in its repertoire and carries no cost to it — and the operator's skill reduces entirely to noticing what people do anyway. Everything else in the law requires either a victim or an expenditure.
Psychology — Messenger Effect & Source Credibility
Hovland and Weiss put an identical article under two different attributions and measured a large difference in how persuasive people found it. The content did not move; the source did. Who says it changes what it does.
That finding is usually read as a warning — audiences are irrational, they should attend to arguments rather than speakers. Omar's manoeuvre reads it as an instruction, and the reading is the insight.
If reception is determined by source, then the highest-leverage decision available is not what to say but whose mouth it comes out of — and unlike the message, the mouth can be chosen. Omar's news is unimprovable as content: he has converted, and that is either interesting or it isn't. What he can change is whether Mecca hears it from an interested party announcing his own conversion or from a bystander who could not contain himself.
Those two versions have different persuasive weights for a reason the source-credibility literature names precisely: the second messenger has no apparent stake, and a message from someone with nothing to gain is discounted less. Jamil is not merely fast; he is disinterested, and disinterest is the single most valuable property a source can have.
Which gives the technique's actual optimisation target. Not reach, not speed. You are shopping for the transmitter whose relationship to the news is most obviously accidental, because that is what converts a claim into a fact. And it explains why the manoeuvre survives verification: checking the source returns a man with no motive, which is true.
History — The Homefront Supply-Collapse & Rumor Ecology
Petrograd, winter 1916: white bread has vanished from the capital of one of the greatest wheat-growing countries on earth, the grain exists, and the empire cannot get a loaf into a city. What fills the gap is rumour — an entire information ecology in which nothing can be sourced, everything is circulating, and no claim can be traced to an origin.
Set that beside Omar's Mecca and the pair produces the technique's scoping condition.
Omar's plant works because the network is legible and sparse. There is one known fast node. Its behaviour is reliable. A fact entering through it can be expected to arrive at a knowable audience in a knowable time, and — critically — to arrive attributed to Jamil's indiscretion rather than to Omar's intent, because in a sparse network people can see where things came from.
A saturated rumour ecology destroys all three properties at once. When everything circulates and nothing is sourced, there is no distinguished node to select, no predictable transmission, and — the part that matters most — no attribution for the plant to hide behind, because nothing in that environment is attributed to anyone.
That inverts the intuition. You would expect a rumour-rich environment to be the easy case for planting. It is the hard case. Planting requires a network with functioning attribution, because the whole return comes from the fact reaching its target wearing somebody else's name. Where nothing has a name, a plant is just one more unverifiable claim in a city full of them — and the Petrograd page's own subject is what happens when that condition holds at scale, which is that the population stops believing anything and acts on dread instead.
Sharpest implication. The strongest version of this technique contains no false statement anywhere. Omar had converted; Erickson's readings were his own. What is falsified is not the information but the operator's relationship to its delivery — and that relationship is the one thing nobody in the chain thinks to check, because it does not look like a claim at all. It looks like an accident, which is precisely what a request for confidentiality made to a known gossip is designed to look like.
Generative questions