I loved all five of the previous books in the Washington Poe series. The interactions between the gruff, sullen, dedicated Detective Poe and Tilly, an asocial genius highly skilled in mathematics and technology, added humour to the books with her naive, unfiltered comments. She lacks social skills and is oblivious to social cues. Their friendship and dependence on each other in crime investigations have grown throughout the series. Unfortunately, she is so busy searching the internet for clues to aid Poe in solving this intricate case that her presence is felt less. In the remote cottage, Poe lives with Estelle Doyle, the abrasive pathologist. Both women are highly supportive of Poe, along with his boss, DI Stephanie Flynn. He has almost no other friends. The book begins with Poe in a therapy session and distressed about nightmares of crows. He narrates a story leading up to his mental/emotional torment.
As Poe and Tilly become immersed in a complex new crime case, a man named Linus has been ordered to follow their investigation. Poe does not trust Linus and is suspicious of the reason for his presence. He is sarcastic toward him, calls him Snoopy, and treats him as his intern, giving him trivial jobs or escaping his presence.
Nothing is what it seems in this story, with twists, hidden clues, and motives. There is an intense narrative of dread and suspense, but I often felt manipulated and conscious of being tricked that I failed to be fully engaged as a reader.
The mystery begins with a heavily tattooed man who has been stoned to death and the investigation of a nearby cult. There seems to be a connection with a family massacre fifteen years earlier. I will not spoil this overly complicated plot by mentioning story details. It contains gore and torture, death of young people, prejudice against gays by religious fundamentalists, extreme cult beliefs, videos of despicable acts, mental health, incest, conversion therapy, and family dysfunction. What is a Mercy Chair, and how was it used?
This compelling book may be read as a stand-alone, but reading earlier books in the series will explain the strong and unlikely friendship between Poe and Tilly and how she became essential in helping solve crimes.