Their crash is witnessed by Rachael Abbott, a young woman who has just narrowly escaped drowning by assailants who drugged her, tied her to a cement block, and threw her into Black Rock Lake. When Savich and Sherlock arrive in Parlow, they discover Jack is down but not out, that Rachael saved his and Dr. MacLean’s lives, and that she’s hiding something big. To add to the complexity of the situation, Dr. MacLean has been diagnosed with frontal lobe dementia, a pernicious disease that makes the victim say whatever comes to mind with no regard to consequences. With a patient list of Washington’s elite movers and shakers, MacLean has almost certainly compromised doctor-patient confidentiality, and one of his patients, they presume, is out to shut him up. But which one, and why?