In Acapulco, Hercule Poirot attends a dinner party in which one of the guests clutches his throat and suddenly dies. The causes seem to be natural until another party with most of the same guests produces another corpse.
An American movie actress, best known for playing dumb blondes, is Scotland Yard's prime suspect when her husband, Lord Edgware, is murdered. The great detective, Hercule Poirot, digs deeper into the case.
Dr Calgary returns home from an expedition and goes looking for a hitchhiker whom he gave a lift to two years previously in order to return the man's address book. He discovers the man has been executed for his mother's murder.