Karen M. McManus (born 1969) is an American author of young adult fiction.

[3] She attended the College of the Holy Cross, earning a bachelor’s degree in English literature, then attended Northeastern University, where she received a Master of Arts (M.A.)

One of Us Is Lying was optioned as a pilot by NBC, and the television adaption premiered on Peacock in October 2021.

[5][6][7] Two Can Keep a Secret was McManus’ first standalone novel outside of the One of Us Is Lying trilogy.

[1] She rereads The Secret History by Donna Tartt every year.