In The A. B. C. Murders, what facts point to and against Cust being the murderer? What are Cust's possible motives for each murder? Why would Cust write letters to Poirot before each murder? How might Cust profit from each murder?

In The A. B. C. Murders, more facts point toward Alexander B. Cust being the murderer than against it. His initials are A. B. C., he was at some of the crime scenes, letters to Hercule Poirot were typed on a typewriter in his room, where silk stockings were also found, and he left the cinema with a bloody knife and blood-stained sleeve. Cust has an alibi for the second murder, however, and, as an epileptic, he suffers from memory lapses.

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In Agatha Christie’s detective novel The A. B. C. Murders , almost all the evidence that the police and Hercule Poirot uncover points toward the guilt of Alexander Bonaparte Cust. His initials are A. B. C., matching those of the murderer who writes the letters to detective Hercule Poirot...

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In Agatha Christie’s detective novel The A. B. C. Murders, almost all the evidence that the police and Hercule Poirot uncover points toward the guilt of Alexander Bonaparte Cust. His initials are A. B. C., matching those of the murderer who writes the letters to detective Hercule Poirot that precede the murders. Cust sells silk stockings, which matches a description of the possible murderer as someone who sold stockings to some victims. When he is identified as being present at the crime scenes, a typewriter found in his room proves to be the one used in the letters to Poirot. Because Cust has an alibi for the time that one of the murders was committed, the case against him is far from watertight.

The fourth murder should have corresponded to the letter d, but an apparent coincidence spared the man whose name started with d, and a man with an e name is killed instead. Cust was present at the cinema where this murder occurred and later finds that he has blood on his sleeve and a bloody knife in his pocket.

When he is identified as the likely suspect, Alexander Cust provides a long story about a job for which he was hired, in which capacity he was furnished with a typewriter. However, his inability to produce corroboration casts further suspicion. He claims that his presence at or near the location of some murders is connected with this employment.

The biggest point in his favor is his alibi for the time of the b murder. Having struck up a casual acquaintance, he ended up playing dominoes with a man named Strange, who is absolutely certain that Cust was with him that night. Cust worries that he might have committed the other murders, because he suffers from blackouts related to epilepsy.

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