Bizarre mutilations are found on San Francisco's Golden Gate Bridge, and the modus operandi hides high-end bridge technology. Detective Erin investigates, but all the clues point to her own past life. Her partner, Leo, is acting strangely, and the suspicion grows deeper. As the investigation progresses, the identities of an undercover DEA agent and a bridge engineer become intertwined with family secrets and criminal conspiracies. As the truth emerges, Irene is faced with a life-or-death decision, nanobots and a mysterious program make a last-minute appearance, and what does a mysterious figure in the depths of Alcatraz portend?
