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A horrific crime that defies ordinary explanation. A rookie FBI agent in dangerous, uncharted territory. An extraordinary hero for the ages.

Odessa Hardwicke's life is derailed when she's forced to turn her gun on her partner, Walt Leppo, a decorated FBI agent who turns suddenly, inexplicably violent while apprehending a rampaging murderer. The shooting, justified by self-defence, shakes the young FBI agent to her core. Devastated, Odessa is placed on desk leave pending a full investigation. But what most troubles Odessa isn't the tragedy itself - it's the shadowy presence she thought she saw fleeing the deceased agent's body after his death.

Questioning her future with the FBI and her sanity, Hardwicke accepts a low-level assignment to clear out the belongings of a retired agent in the New York office. What she finds there will put her on the trail of a mysterious figure named John Silence, a man of enormous means who claims to have been alive for centuries and who is either an unhinged lunatic or humanity's best and only defence against unspeakable evil.