When Billy, a troubled young man, comes to private eye Cormoran Strike’s office to ask for his help investigating a crime he thinks he witnessed as a child, Strike is left deeply unsettled. Trying to get to the bottom of Billy’s story, Strike and Robin Ellacott - once his assistant, now a partner in the agency - set off on a twisting trail that leads them through the backstreets of London, into a secretive inner sanctum within Parliament, and to a beautiful but sinister manor house deep in the countryside. And during this labyrinthine investigation, Strike’s own life is far from straightforward. Plus, his relationship with his former assistant is more fraught than it ever has been…