Agent Nicholas Grayson is assigned to investigate occult influences behind major domestic terror events. Sent to San Diego under Operation Watchtower, he must track extremist groups and enlist hacker Belle Flower. Belle flees a mysterious assailant tied to her traumatic past. Meanwhile, senator Bryce Wexley, haunted by his involvement in a government cover-up, experiences visions of alien forces and his own complicity. All three are caught in a dark, interconnected conspiracy.