In her first published mystery, Agatha Christie introduces readers to the heroic detective, Hercule Poirot. 'The Mysterious Affair at Styles' is a classic murder mystery set in the outskirts of Essex. The victim is the wealthy mistress of Styles Court. The list of suspects is long and includes her gold-digging new spouse and stepsons, her longtime hired companion , a young family friend working as a nurse, and a London specialist on poisons who just happens to be visiting the nearby village.