A secret group of retired experts hunt a methodical serial killer, in this compelling debut crime thriller set in London . . . Widowed and in his sixties, Thomas Quinn has been invited to lunch by Lexington Smith, the leader of a covert team who call themselves The Twelve. When Thomas decides to join group, he finds himself united with other retired specialists—from a surgeon to a locksmith to a cabbie—in a quest to capture and assassinate a killer targeting homeless victims on London’s transport system. Also on the team is Monica Lodhia, a retired chemistry professor with a tragic past to whom Quinn feels drawn. As the body count rises, Thomas, Monica, and the crew try to determine a pattern. But can they protect this vulnerable population by identifying a predator before he strikes again?