In the throes of a quarter-life crisis, Megan panics when her boyfriend proposes, then, taking an opportunity to escape for a week, hides out in the home of her new friend, 16-year-old Annika, who lives with her world-weary single...

Seven strangers find themselves trapped in an underground storage facility, struggling to survive while being hunted by a supernatural beast that resides inside the mysterious 13th unit.