Beech investigates a series of jewellery robberies. Meanwhile, Loxton and Quinnan deal with a frightened young man who has been the subject of an attack at a local car lot. However, the attack proves to be the link that Beech needs to put the spotlight on his prime suspect. Croft and Lines are dismayed by Beech's methods when he sets up an innocent victim for a beating in order to uncover the location of the assailant.