When local GP Angela Benton is murdered in a children's playground, detectives Bobby Day, Nina Suresh, and Alec Wayfield embark on what appears to be a straightforward murder investigation. However, it soon becomes apparent that Angela's death has more to it than meets the eye.

Alec is rescued from the water and has an unexpected visitor in hospital… Meanwhile, in Dusseldorf, Linda has a breakthrough and she starts to believe that Ruben Locana's death wasn't an accident. And it's a race against time as Bobby, Nina, and Alec try to locate the mystery pages at the heart of the case.