A shy woman finds that a cat is actually a cursed "Casanova". She falls for the man but finds that her Prince Charming is actually a scoundrel.

Lovely young actress Valerie St Clair, engaged to marry Prince Paul of Maurania, is the only witness to the murder of Henry Reedburn, a shady and overbearing producer. Prince Paul appeals to Poirot to save Valerie from police suspicion, and the great detective finds he has a conundrum to ponder on - 'When is a murder not a murder-