In the novel The A.B.C. Murders, Alexander Bonaparte Cust is a travelling salesman with a pompous name. He sells stockings and is epileptic. He fought in the war, and received a blow on head, making him prone to blackouts and severe headaches.
He is a suspect in the murders of Alice Ascher, Betty Barnard and Carmichael Clarke, and even though he had an alibi for the murder of Betty Barnard, the police said the alibi was fake.