The Household's Competing Suspicions

Guests repeatedly mistake visible flaws and apparent motives for proof, showing how suspicion shifts as incomplete evidence is interpreted through personal bias.

increasingBearing stren­gth in each eventdecreasing

Hastings Suspects Allerton

The Obvious Villain Dislike becomes evidence Hastings finds Allerton vain, sexually predatory, and morally untrustworthy. He quickly imagines that Allerton could be X, even though he has no evidence tying him to the earlier cases. Bias narrows the field The suspicion grows from genuine knowledge of Allerton's conduct but does not explain the pattern of deaths. Hastings's certainty shows how a real vice can distract from a different criminal method.

The Doctor Looks Guilty

Suspicion Follows Opportunity A plausible professional suspect Franklin has laboratory access, knowledge of poisons, and a wife whose death frees him to pursue Africa. His bluntness after her death makes him appear callous. The evidence misleads Boyd Carrington and Nurse Craven suspect him, while the inquest hears a case for suicide. Poirot knows Barbara was the intended killer and that Franklin is not responsible for her poisoning.

The Suspicion on George

Motive in Plain View A public quarrel George has been humiliated by Daisy, then fires the shot that wounds her. Guests wonder whether the accident was intentional because both motive and opportunity appear present. Affection complicates judgment His distress at Daisy's bedside makes Hastings doubt the theory, but the incident still fits the apparent-culprit pattern. Poirot's explanation shows that Norton engineered the context rather than firing the rifle himself.

The Telescope's Mystery

A Misread Glimpse Hastings supplies the scene Norton sees something through his telescope and resists handing it to Hastings. Hastings assumes the hidden sighting concerned Judith and Allerton because they dominate his thoughts. The missing fact persists The actual sighting remains undisclosed until Norton speaks to Poirot. The episode demonstrates how a witness may see something real while another person's obsession invents its meaning.

The Final Suspect Reversal

The Observer Was the Criminal Innocence arranged as evidence Norton is neither the direct killer in the earlier cases nor an innocent bystander. He manipulates other people into acting, leaving each with a motive and an apparent confession or means. Poirot's guilt exposed The final reversal identifies Poirot as Norton's killer, not because he was mistaken about Norton but because he chose extralegal punishment. Hastings's assumptions about appearance and guilt collapse together.

At the first dinner after Hastings arrives

After Barbara Franklin's death and inquest

Immediately after Daisy is shot

After Norton abruptly lowers his binoculars

After Hastings reads the manuscript in Eastbourne