After waking up surrounded by dead bodies and no memory, Myfanwy Thomas is thrown into the world of the Checquy, a paranormal secret service where she's a high-level operative known as a "Rook" - and no one can be trusted.

While Myfanwy revisits the crime in search of her past, Monica discovers a dark truth about one of the victims - her lover and fellow agent. One of Myfanwy's dead attackers disappears from the morgue.