The collection of Agatha Christie's three novels. Books included in this collection:


The Secret Adversary: Book introduces the world to the adventures of intrepid detectives Tommy and Tuppence, or as they are more formally known, Thomas Beresford and Prudence Cowley. The two young friends find themselves out of work after the end of the first world war and form the partnership "The Young Adventures, Ltd." They are immediately hired by a mysterious individual by the name of Mr. Whittington to find a young lady named Jane Finn. Jane has not been seen in the five years since she was on board the Lusitania when it sank. She is believed to be alive and in possession of a treaty, the contents of which the government prefer remain hidden. Tommy and Tuppence, hot on Jane's trail, are quickly drawn into a dangerous world of government secrets, violent kidnappers, hidden identities, and murderous plots. Christie is a master at creating suspension and intrigue, as well as believable characters and engaging dialogue, and these gifts are evident throughout this clever and entertaining novel.


The Man in the Brown Suit: Anne Beddingfeld is on her own and ready for adventures when one comes her way. She sees a man die in a tube station and picks up a piece of paper dropped nearby. The message on the paper leads her to South Africa as she fits more pieces of the puzzle together about the death she witnessed. There is a murder in England the next day, and the murderer attempts to kill her on the ship en route to Cape Town. The setting for the early chapters is London. Later chapters are set in Cape Town, Bulawayo, and on a fictional island in the Zambezi. The plot involves an agent provocateur who wants to retire, and has eliminated his former agents.


The Secret of Chimneys: At the request of George Lomax, Lord Caterham reluctantly agrees to host a weekend party at his home, Chimneys. A murder occurs in the house, beginning a week of fast-paced events with police among the guests.