Alex seems to have it all, a dream internship on a popular true crime show and a too-good-to-be-true fiance. Now her friends have planned the ultimate bachelorette party with Alex's unusual set of interests in mind--a weekend in a "haunted' cabin, the site of the infamous "666 Killings" from years ago. Caught in a blizzard at the bare-bones lodge, the friends still make the most of their unique celebration. But in the middle of the night, Alex wakes up to a nightmare. Her friends have vanished, blood spattered all over their sleeping bags. In shock, she has no idea what happened. But Alex worries the decade-old murder has come back to haunt them, and she is the one to blame. Her recent prison interview with the 666 Killer seems to have stirred up past demons, throwing her friends into danger. The prisoner has always maintained his innocence, claiming the "real killer" was still out there. Has the true 666 Killer finally returned? Or has the convict been scheming mayhem from his jail cell? On this topsy-turvy night, nothing is as it seems. And with no help in sight, Alex must rely on her true-crime savvy to solve the case and save her friends. But even she does not see the final, staggering twist coming, and the shocking truth might just kill her.