Karen M. McManus (born 1969) 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 five years on The New York Times Best Seller list, as well as its sequels One of Us Is Next and One of Us Is Back, and the stand-alone novel Two Can Keep a Secret. Early life and education. McManus discovered an interest for writing when she was eight years old and was assigned to write a story in school.
https://en.wikipedia.org/wiki/Karen_M._McManus