Mike investigates when two businessmen open up a restaurant that is targeted in a series of attacks. Meanwhile, Greengrass develops a sudden interest in archaeology, convinced Aidensfield is full of buried treasures just waiting to be discovered. Unfortunately for him, the first items unearthed prove to be human remains, leading to fears that there is a murderer at large. Elsewhere, Gina's old friend Debbie comes to stay at the Aidensfield Arms and seems to be hiding something, leaving Aunt Mary fearful that Debbie will lead Gina astray.