Presumably first appeared in the UK magazines, seven of them were written in the twenties and in the thirties. Only The Harlequin Tea Set was in 1971. Interestingly, the copyright of five of them were signed as Mrs. Mallowan; hence after her divorce in 1928.
Poirot’s cases concern with a reconstruction of a suicide and the death of an old eccentric well-to-do man who summons the Belgian to his home. In the former story, it starts when he receives a telephone call from a mysterious woman begging for his help. ‘…table with yellow irises,’ she sounds frightened of being overheard. In the latter, a shot is heard moments after the first gong for dinner but a guest firmly believes of having heard the second gong. Four years later the same plot appears in Dead Man’s Mirror (see Notes On The Murder In The Mews) with alterations to the character names.