When Claire and her husband James attend a medical school reunion, they reconnect with an old classmate named Morgan, who is secretly obsessed with James and plans to sabotage Claire’s life so she can have him all to herself.

When brilliant but isolated high school senior Clara’s English teacher dies mysteriously, a charismatic replacement arrives who takes a disturbing interest in her academic potential. As Mr. Heller’s mentorship turns to dangerous obsession, Clara uncovers his horrifying secret identity and murderous past. Now trapped in a psychological game with a predator who’s eliminated anyone standing in his way, Clara must use her understanding of Heller’s twisted psychology against him before she becomes his next victim. Some lessons are worth dying for – others are worth killing for.

Julia, a lonely and ostracized teenager, is coming to terms with the disappearance of her best friend when she discovers a mysterious social media account called 'The Family'.