In this avant-garde hacker, the cruel social media game about terror is out of control, and teenage terror is back. The night when a star athlete was murdered after Whiton University unveiled an assassination charge has sparked a series of social media-related killings. When a masked killer targets students throughout the campus, the three sisters race against the clock to reveal the truth behind the hidden secrets of the school-and the horrific meaning of an exclamation point-and then they become the killer's next victim.