Mike is called to investigate when two businessmen Alan and Dennis open a restaurant that is targeted in a series of attacks. Alan's business rival Sid Wainwright is put in the frame. At the same time, Gina receives a visit from her old friend Debbie, who has history with the two restaurant owners. Meanwhile, Greengrass takes part in an archaeological dig on the lands of Terence Young and finds some ancient remains. As usual, he hopes to exploit the financial credit for his discovery.