"The Devil You Know" is a psychological thriller novel by Elizabeth Haynes. The story follows the life of a woman named Catherine, who becomes entangled in a web of deceit and danger after a chance encounter with a former acquaintance. As she navigates her complex relationships, she must confront her past and the dark secrets that threaten her future. The novel explores themes of trust, betrayal, and the impact of choices on one's life. With its gripping narrative and well-developed characters, "The Devil You Know" keeps readers on the edge of their seats, questioning the true nature of those around them.