Dear Debbie is a 2026 psychological thriller novel by American author Freida McFadden. The novel follows Debbie Mullen, a Massachusetts housewife and advice columnist whose life unravels after she is fired from her newspaper, prompting her to take violent revenge against the people she believes have wronged her and her family. No. 1 on The New York Times Fiction best seller list for 1 week, from the issue of February 15, 2026 (Poisoned Pen Press). Wiki link