First published in 1920, The Mysterious Affair at Styles was Agatha Christie\'s first novel.
The obvious suspect is Emily\'s husband, who stood to inherit a large fortune upon her death..
Captain Hastings, a guest at the house, calls upon his friend Poirot to help investigate.
The mystery begins with the death of Emily Inglethorp at Styles, a manor in the English countryside.
It introduced the world to Hercule Poirot, Christie\'s Belgian detective, who would go on to be featured in 39 of her novels.
First published in 1920, The Mysterious Affair at Styles was Agatha Christie\'s first novel