Substitute

Following his heart attack, Blaketon is forced to face the fact that his police career is over. He resigns himself to it - until he discovers a troublesome family who viciously attacked a police officer years previously, are back in Aidensfield. Ventress faces up to his old foes - and is subsequently kidnapped. Can Mike and Bellamy save the veteran cop? Meanwhile, Greengrass allows a group of girl guides and their lieutenant to camp out on his land - for a reasonable price!