April 1999, Mount Pleasant, New Hampshire. The body of a young woman, Alaska Sanders, is found on the shore of a lake. The investigation is quickly closed, the police obtain the confessions of the culprit, who kills himself soon after, and of his accomplice.
Eleven years later, however, we discover the case is not really solved. Sergeant Perry Gahalowood, who was conducting the investigation at the time, receives a disturbing anonymous letter. What if he followed a red herring? The help of his writer friend Marcus Goldman, who just had huge success with The Truth About the Harry Quebert Affair, inspired by their common experience, will once again be crucial to uncovering the truth.
But there is a mystery in the mystery: the disappearance of Harry Quebert. Ghosts of the past return and, among them, the one of Harry Quebert.