Fresh out of rehab for oxycodone addiction, Casey and some of her friends attend an all-night rave called Survive the Night in the New York City subway, and find themselves fighting for their lives because drugs are not the only danger here--something is using the rave to attract victims, and some of them will not be coming back.

"Brooklyn Stevens sits in a pool of her own blood, tied up and gagged. No one outside of these dank basement walls knows shes here. No one can hear her scream. Sofia Flores knows she shouldnt have gotten involved. When she befriended Riley, Grace, and Alexis on her first day at school, she admired them, with their perfect hair and their good-girl ways. They said they wanted to save Brooklyn. They wanted to help her. Sofia didnt realize they believed...

When she receives a call on her teen helpline describing abuse at a local parish, Brooklyn tries to aid the anonymous caller and finds herself plunged into the cultish community of Christ First Church's youth group where she tries to rid the church of evil.