Criminals as gamblers: luck eventually turns

The concept that criminals are gamblers who eventually lose their run of luck is central to Hercule Poirot’s explanation of how the investigation may turn. He distinguishes a murderer’s planning from the chance no plan can eliminate: early success encourages overconfidence, but continued risk makes failure increasingly possible. The roulette wheel provides both his model for that reversal and the scene’s final emblem of hope.

The Gambler’s Error

Poirot presents the murderer as a gambler wagering more than money: the criminal risks his life. In his account, success feeds a mistaken belief that success will continue. Rather than leave the table while ahead, the criminal credits each successful crime to personal cleverness and discounts the luck that helped it succeed. The distinction matters because a murderer who sees only skill is less likely to recognize when circumstances are turning against him.

The metaphor rests on the recurring alternation of roulette colours. Poirot invokes a long run on black followed, eventually, by red, and describes that reversal as a consequence of the laws of chance. His point is not that a particular crime is mechanically bound to fail on the next attempt, but that repeated success cannot guarantee future success. Each additional crime is another wager, and the criminal’s confidence may grow precisely as the risk accumulates.

Chance in the Crimes

To make the argument concrete, Poirot imagines someone entering Mrs Ascher’s shop just as the murderer leaves. The person might look behind the counter, discover the dead woman, and either seize the murderer or give the police an accurate description. The imagined interruption shows how an apparently successful crime could have ended differently through an ordinary contingency. Planning alone does not command every person who might arrive or every choice that person might make.

Franklin Clarke accepts the practical implication: a murderer has to take a chance. Poirot agrees, but develops the point beyond a single possible mishap. In his view, the successful criminal repeatedly assumes that the next risk will go as well as the last. That confidence distorts judgment: instead of recognizing the contribution of luck, the murderer becomes more certain of his own ability, and the resulting loss of proportion makes further mistakes more likely.

The Turn in the Investigation

Poirot applies the idea to the case by saying that luck has so far favoured the criminal, but must sooner or later turn toward the investigators. He identifies the clue of the stockings as the beginning of that reversal. The clue does not, in this exchange, amount to a completed solution; its importance is that Poirot reads it as evidence that the pattern of effortless success has broken. He expects the criminal to begin making mistakes where previously things seemed to go right.

The prediction answers the anxiety around the discussion as well as advancing its reasoning. Megan Barnard asks whether Poirot believes the turn will happen in this case, while Franklin Clarke calls the argument heartening. The conversation thus makes the gambling theory an interpretation of the investigation’s present uncertainty: the investigators cannot control chance, but Poirot believes it is no longer operating only for their opponent.

Roulette as an Omen

The chapter closes by converting the metaphor into an action. After Arthur Hastings leaves Poirot beside the window, a little roulette wheel is in front of him. Poirot spins it and calls the result red, treating the colour as a good omen and announcing that luck is turning. The wheel does not establish the criminal’s guilt or prove that the case has been solved. Instead, it gives visible form to Poirot’s renewed confidence: the colour that succeeds black becomes a small, deliberate sign that the run may have changed.

The image also links analytical argument to dramatic closure. Earlier, roulette illustrates the limits of a criminal’s control; at the chapter’s end, its result offers the investigators reassurance without removing the uncertainty they face. Chance remains chance, but Poirot’s willingness to interpret the red result as encouragement makes the wheel an emblem of his confidence that the criminal’s overconfidence will eventually bring its own reversal.