"The Undoing" is a psychological thriller novel by Jean Hanff Korelitz that explores themes of deception, privilege, and the complexities of marriage. The story follows Grace Sachs, a successful therapist, whose life unravels when her husband, Jonathan, is accused of murder. As the investigation unfolds, Grace grapples with her own perceptions of love and trust. Set in the affluent world of New York City, the novel delves into the impact of societal expectations and the hidden truths within relationships. As secrets come to light, Grace must confront the reality of her life and the choices she has made, leading to a gripping and suspenseful narrative.