Secret Adversary and the Mysterious Affair at Styles

Two classic Christie mysteries packed together make this an ideal follow-up for viewers who liked origin-focused detective drama. For fans chasing the Young Sherlock reimagining, these books offer early-career sleuthing and an espionage-tinged plot that foregrounds partnership and puzzle-solving.

Collected here are Secret Adversary and The Mysterious Affair at Styles, the novels that introduced Tommy and Tuppence and Hercule Poirot, noted for intricate plotting and period detail.