This is the first novel about the amusing adventures of amateur detectives Tommy and Tuppence Beresford. The action takes place in the early twenties of the last century. A sweet couple of young adventurers, looking for a mysterious document that disappeared after the tragic death in 1915 of the transatlantic liner Lusitania, is involved in a gigantic international conspiracy. Only the resourcefulness of the "partners in crime" can prevent a new world war.
