Illustrated short story from the Queen of Crime. Chief Inspector Japp asks Poirot to assist Scotland Yard in the strange events which took place at a recent costumed Victory Ball. A group of six people, headed by the young Viscount Cronshaw, attended dressed in the costume of the Commedia dell'arte. Lord Cronshaw was Harlequin, his uncle, the honourable Eustace Beltane, was Punchinello and Mrs Mallaby, an American widow, was Punchinella. In the roles of Pierrot and Pierette were Mr and Mrs Christopher Davidson (he being a stage actor) and finally, Miss "Coco" Courtenay, an actress rumoured to be engaged to Lord Cronshaw, was Columbine. The night went badly from the start when it was obvious to the party that Cronshaw and Miss Courtenay were not on speaking terms. The latter was crying and asked Chris Davidson to take her home to her flat in Chelsea.