X's method of crime

X's method of crime is to bring about murders that look complete in advance: each has an apparent motive, opportunity, means, and a guilty person ready to stand trial, while no discoverable connection leads back to X. Poirot’s comparison of five earlier cases teaches Hastings to look past who appears to have committed each crime and ask who may have arranged the conditions that made it possible.

The Pattern in the Earlier Cases

Poirot’s first clue is not a common victim or a shared motive, but the absence of genuine doubt about who committed each murder. Mrs Etherington was acquitted, yet everyone remained convinced she was responsible. Freda Clay was not openly accused, but no one proposed another solution. Riggs said he could not remember killing his wife and her lover, and nobody seriously suspected a different perpetrator. Margaret Litchfield confessed. In every case, the apparent answer was singular and clear, even where the formal outcome or the accused person’s account left room for uncertainty.

That pattern distinguishes these crimes from mysteries in which several suspects remain in contention. The cases seemed individually settled: someone had an apparent reason to kill, and the inquiry could stop with that person. Poirot asks Hastings to recognize that the consistency lies not in the victims’ circumstances but in the way blame appears to resolve itself.

X’s Concealed Presence

Poirot describes X as having no apparent motive in any of the cases. In one, X was apparently two hundred miles away when the murder occurred. But X had been on intimate terms with Etherington, had lived for a time in the same village as Riggs, knew Mrs Bradley, was photographed walking in the street with Freda Clay, and was near the house when Matthew Litchfield died. The repeated proximity makes coincidence increasingly difficult to accept, even though no single connection establishes a clear motive.

The apparent contradictions are part of the problem. X may be far away at the time of a crime yet still be associated with its people and circumstances; X may repeatedly appear near the edges of the cases without occupying the obvious role of suspect. Hastings recognizes that five such overlaps suggest a connection, but Poirot warns that finding a direct link between X and a victim is precisely what his technique prevents. The connection, he says, will be hidden beyond what either detective can discover by simply looking for it.

The Completed Crime

Poirot’s key formulation is that, when the crime is committed, it is already complete. It has a motive, an opportunity, and means, and—most importantly—a guilty person apparently ready for the dock. The apparent perpetrator is not merely one possibility among many: that person supplies the clear, conventional explanation that the earlier cases share. X’s own role remains outside that finished pattern, with no visible evidence tying X to the death.

This makes the method one of concealed orchestration rather than an ordinary puzzle of competing suspects. The visible crime points toward a person who seems to satisfy the case, while X’s repeated association with the separate cases does not become a usable connection to their deaths. The structure depends on the difference between the person who appears to have committed the murder and the unseen influence that has made that explanation available.

Hastings Learns What to Look For

Hastings initially treats the problem as a guessing game: if he could identify X, he thinks, he could understand the connection. Poirot rejects that approach. He reminds Hastings that the point is not to guess X’s identity, but to study the technique revealed by the cases. When Poirot calls Hastings mentally lazy for preferring guesses to analysis, the rebuke turns the previous case summaries into a practical lesson in detection.

The lesson changes the direction of the inquiry. Rather than search for someone connected to the victims in an obvious way, Hastings must look for a person who answers to the requirements of a complete crime—the potential victim in a situation where motive, opportunity, means, and an apparent culprit can already be assembled. The method therefore shifts attention from the finished cases of the past to the possibility of a crime being prepared in the present.

Narrative and Detective Significance

The five-case comparison makes absence itself an investigative clue. No single earlier case provides a visible chain back to X; the pattern emerges only when Hastings and Poirot place the cases beside one another and notice both the repeated certainty about guilt and X’s recurring proximity. Poirot’s insistence that the connection cannot be found by ordinary searching underscores how deliberately the apparent solutions conceal the larger design.

The method also exposes a weakness in seemingly decisive explanations. An acquittal, a confession, an asserted failure of memory, or the lack of an alternative suspect may leave the public with a clear culprit without revealing how that certainty was produced. Poirot’s instruction is consequently methodological as well as factual: resist guessing at identity, examine how a crime becomes complete, and ask whose situation is ready to supply its apparent motive, opportunity, means, and blame.