Twenty-four hours after Bella Estes's body was found floating in the lake, her "accidental drowning" became a murder investigation—and all eyes turned to Mackenzie Reed, the last person seen arguing with her. For eight years, Mackenzie has lived under the shadow of suspicion, branded by the media as "the College Heights student who got away with murder." The one person who could have cleared her name—her former summer camp flame—refused to provide her with an alibi. But now, new evidence has surfaced, casting doubt on everything Mackenzie and Celeste thought they knew about Bella, about each other, and about the idyllic mountain retreat where it all began. As they reluctantly reunite to uncover the truth, one question haunts them: Is the real killer still watching and waiting in the shadows—ready to strike again?