Brigid Quinn is a retired FBI agent who spent her career undercover, working on sexual predator cases, and trained her protege, Jessica, to follow in her footsteps. Jessica went missing while working on a serial-killer case, and Brigid never recovered from the loss. Several years later she learns that there has been an arrest in the case, but the new agent working it, Laura Coleman, thinks the confession is false. When Coleman disappears and the bureau doesn't seem to notice, Brigid finds herself in the thick of things once again.