The hollow ones

Odessa's life is derailed when she's forced to turn her gun on her partner, who turns suddenly, inexplicably violent while apprehending a rampaging murderer. The shooting, justified by self-defence, shakes Odessa to her core and she is placed on desk leave pending a full investigation. But what most troubles her 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, Odessa 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 Blackwood, a man of enormous means who claims to have been alive for centuries.