FBI neuroscientist Sayer Altair hunts for evil in the deepest recesses of the human mind. Still reeling from the death of her fiance, she wants nothing more than to focus on her research into the brains of serial killers. But when the Washington D.C. police stumble upon a gruesome murder scene involving a girl who'd been slowly starved to death while held captive in a cage, Sayer is called in to lead the investigation. When the victim is identified as the daughter of a high profile senator, Sayer is thrust into the spotlight.

As public pressure mounts, she discovers that another girl has been taken and is teetering on the brink of death. With evidence unraveling around her, Sayer races to save the second victim but soon realizes that they are hunting a killer with a dangerous obsession...a killer who is closer than she thought.