On the morning of 18 July, the household at Styles Court wakes to the discovery that Emily Inglethorp, the elderly owner, has died. She had been poisoned with strychnine. Arthur Hastings, a soldier from the Western Front staying at this country manor as a guest on his sick leave, ventures out to the nearby village of Styles St Mary to enlist help from his friend Hercule Poirot. Emily was a wealthy woman. Her household includes her husband, Alfred Inglethorp, a younger man she recently married; her stepsons (from her first husband's previous marriage) John and Lawrence Cavendish; John's wife Mary Cavendish; Cynthia Murdoch, the daughter of a deceased friend of the family; and Evelyn Howard, Emily's companion.