The stakes are personal in FBI Agent Jo Pullinger's latest case... Robert Grantham has been in charge of the Seattle field office for what seems like forever. Despite his long tenure, he's shown no sign of slowing down. Until now. Immediately after a work trip to Idaho, Grantham announces he's stepping down. To Jo, none of it feels right. She believes someone is blackmailing her boss. And she aims to find out who. The quest for the truth will take Jo into the heart of darkness. Sinister forces move in the night, slowly eating away at the foundations of the FBI. Hounded by a dangerous henchman named Ronan Carver, Jo and her allies will do whatever it takes to find justice. But this might be one case that's too big to crack.