Ten years have passed, and Ren Taylor is back, having accepted a job at her old high school. She'd hoped to make peace with the past but now she's thrust back into it: her murdered teenage sister is still immortalized in town, and Ren can't stop seeing her wherever she goes. Then Ren meets physics teacher Bryson Lewis. Handsome and charismatic, all the other teachers and students seem to fall at his feet. But Ren knows men like him --- she knows they can't be trusted. The more Ren watches him, the more suspicious she becomes. And when she notices his close relationship with a girl in one of his classes --- a girl just like her sister --- she worries history is about to repeat itself. This time, she won't sit back and watch another girl be taken before her time.

Ever since that night, twin sisters Cassie and Lenora have been inseparable. As the sole permanent residents of Cabin Two, their refuge on an isolated Tennessee campground, they manage to stay away from prying eyes, probing questions and true crime junkies. The peace and quiet is almost enough to make them forget what happened all those years ago. Almost. Until a teenage girl camping at the neighboring cabin goes missing, and the memories come rushing back. As the crime becomes ever more recognizable, each sister suspects the other knows more than she's letting on. Trapped in the isolating, claustrophobic wilderness, Cassie and Lenora must piece together the truth of what happened --- and the sinister truth lurking in their own pasts --- before it's too late.