When PC Rowan is on patrol one morning he notices Charles Carter who is camping on private land with his son Simon. But Carter has to permission from the owner of the land. Later Rowan notices man lurking around their caravan. The man introduces himself as Clive Loxton, a friend from London. Later Loxton turns up with a woman called Michelle Blanchard, who claims to be Simon's mother and that Carter has abducted him after they got divorced. By then Simon has been taken to hospital with polio. As president of the local Rugby association sergeant Blaketon is allowed to enter a team of his own. One of the players, Ken Fairbrother, is particularly good and Greengrass offers his services as his manager.