 When Brian s dog finds a body on a common, it prompts two people to confess to murder. But when the body turns out to be over 600 years old, Sandra, Jack, Brian and Gerry must discover why the pair took responsibility for a crime they couldn t possibly have committed and if they are in fact the perpetrators of other killings. Elsewhere, Strickland is rather more keen for them to solve an even more tricky mystery closer to home.