Episode 1. DI Frost must deal with a desperate mother and solve a 20 year old missing persons case following the discovery of a teenage girl's remains. Episode 2. The Heal family are appalled to see the man whose lorry killed three of their members some years earlier is driving a bus. Because the lorry 's mechanism was faulty he was acquitted of dangerous driving but the Heals are not happy and Andy Heal goes to the bus depot for a confrontation. Later the driver and his conductress are abducted from their bus. The conductress is diabetic and needs her insulin shots and, after a television appeal, she is dumped, alive, in town, not far from an alley where a clown is found dead. He recently entertained at a children's party where one of the mothers has a pathological phobia of clowns, and believes she attacked him without knowing. However, it turns out that he was also a thief, robbing the houses he visited and his killer may have been somebody else. In solving the death and finding the bus driver Frost's work is not helped by having to work with a female sergeant who had once reported him for being unprofessional. Episode 3. The naked bodies of three young men are found, arranged in a triangle, in a grave at an old burial site and an American anthropologist insists to Frost that these are ritual killings. However the fact that she has a book to promote and reports of unrest among local Eastern European immigrant workers suggest that the murders are not mystical at all. Ever the maverick, Frost enjoys crossing swords with James Callum, an unpleasant local business man who is going to tear down the local youth club to make way for new offices. When Callum's fitness instructress mistress, Rosemary, is found dead on her houseboat, and evidence also suggests that another of Callum's girlfriends died in suspicious circumstances some years earlier Frost cannot wait to pounce. First, however, he must get past Callum's adoring personal assistant, Michael. Perhaps a spot of breaking and entering would help Frost find the clues he is after.