A victim's boyfriend sneaks into a blackmailer's flat to sort him out, but another man's already there, and both don't realise the crook has been murdered before they got there. The police soon arrive, tipped off in advance.
Upon waking up to the news that the man she’d gone on a date with the previous night has been murdered, a young woman with only a faint memory of the night’s events begins to suspect that she murdered him while attempting to resist his advances.
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.
While attending a major horse race with their young son, Nick Jr., Nick and Nora Charles witnesse a shocking murder from the crowded grandstand. What first appears to be an isolated killing soon leads to a maze of corruption, blackmail, gambling scandals, and criminal intrigue. As Nick investigates, he encounters suspicious bookmakers, dishonest officials, rival gangsters, and a mysterious killer determined to stay ahead of the law. Nora, as always, is never far from the action, bringing her quick wit and fearless curiosity to the case.