17-year-old Megan Allen has been jumping from friend group to friend group in her high school, trying on identities like outfits. Nothing ever seems to fit—until she meets LC, the adventurous, charismatic girl who appears at her favorite coffee shop one day. On the night of their friendiversary, what was supposed to be a bonding experience ends in a waking nightmare. Suddenly, Megan is no longer herself. Too late, she realizes that LC has secrets—dangerous...