Novelist Sarah becomes a prime suspect in a homicide after a one-night tryst with a mysterious stranger who turns up dead at her summer home.

Hannah is thrilled with how her senior year in high school is going. Her best friends always by her side, her mom is so very supportive, and she just got a coveted scholarship to Stanford University. However, Hannah joins an online chatroom where she meets a guy she falls for quickly, and things quickly go from very good to awful.

Introduced to a self-improvement program called Initiative by an old friend, a woman finds that Initiative is littered with terrifying secrets that keep its all-female members trapped with no escape. She must investigate Initiative and bring it down before they can fatally stop her.