Karen M. McManus is an American author of young adult fiction. She is most known for her first novel, One of Us Is Lying, which spent more than 130 weeks on the New York Times bestseller list. It received a starred review from Publishers Weekly. One of Us Is Lying was optioned as a pilot by NBC. Its sequel, One of Us Is Next, received a starred review from Publishers Weekly. Kirkus Reviews gave Two Can Keep a Secret a starred review and named it one of the best books of 2019.
McManus attended College of the Holy Cross and Northeastern University, and lives in Cambridge, Massachusetts