The Mysterious Affair at Styles:

A wealthy heiress dead in her locked bedroom. A mysterious poison. A house full of suspects.

When Emily Inglethorp is found dying in her country manor, every member of the household falls under suspicion—including her new, much younger husband. Enter Hercule Poirot, the brilliant Belgian detective seeking refuge from the Great War. With his old friend Hastings at his side, Poirot must untangle a web of family secrets, love affairs, and suspicious behaviors to reveal a killer hiding in plain sight.

In this groundbreaking debut that launched her legendary career, Agatha Christie introduces the world to one of fiction's greatest detectives. With his "little grey cells" and eye for detail, Hercule Poirot sets the standard for all detective fiction to come.

A masterpiece of misdirection that changed the face of mystery forever.