A collection of twelve ingenious, witty mysteries that explore the unexpected secrets hidden within the lives of ordinary people. The protagonist in each story faces a unique, often domestic, conundrum that threatens their social standing or personal safety. These characters must navigate social expectations and logical puzzles to uncover the truth behind disappearances, strange encounters, and deceptive appearances. The narrative framework utilizes a variety of perspectives, maintaining a light-hearted yet suspenseful tone throughout each self-contained investigation.

This collection is widely regarded as a quintessential example of Christie’s lighter, more playful approach to the mystery genre. Readers often highlight the variety of the stories, noting that while they lack the gravity of her full-length novels, they possess a charm and wit that remains distinct. The stories are frequently praised for their concise plotting and the author's ability to craft a complete, satisfying puzzle within a limited page count. The inclusion of diverse scenarios, from train meetings to country house visits, ensures that the collection maintains a high level of engagement throughout. The work serves as a testament to the author's versatility and her mastery of the short-form mystery format.