A number of sheep has been savaged or killed, and Inspector Crossley is convinced that a very big cat like a puma is at large in the area. To Blaketon it looks more like the workings of a dog and Greengrass' lurcher Alfred seems to be the culprit. Kate Rowans starts in her new job at Dr. Radcliffe's surgery in Whitby, although she feels as if she is being kept outside deliberately. Not by Dr. Radcliffe himself, but by his receptionist Christine Ferguson. Meanwhile Greengrass has settled his outstanding account with the Inland Revenue in his own, very unique way.

Believing he has killed his captain in a brawl the Russian sailor Vladimir Ivanov makes himself scarce and asks PC Rowan for political asylum. But Ivanov does not trust immigration officer Fillingham and clears out once again during transport to the immigration office in York. To satisfy his hunger he steals the lunch of Dr. Radcliffe's daughter Jennifer, who is on a field trip with her class. Jennifer wanders off with her friend Dennis and follows the Russian with a childish notion of catching him and become heroes of the day. Sergeant Blaketon starts a big search for both the Russian and the two children.

Dr. Kate Rowan is spending several nights per week in Whitby while she works in the Whitby practice. Nick isn't happy at being left alone. Nick gets rebuked by Blaketon because his shirt isn't ironed. Blaketon says it shows lack of respect for the job. Lead has been stolen from the roof of a farm house and some out-buildings. Smoke pours from Greengrass' house and three young men who are camping on his land see the smoke and rush to help. Kate has discovered that she is pregnant and she thinks about the way a baby would affect her career, and Nick's. Lead has been stolen from a church roof. Blaketon has realised that there is something wrong in the Rowan household and he goes round to see Nick for a personal chat. Nick confides in him that he thinks he and Kate are drifting apart. Kate is back in Aidensfield and she runs into Nick. She tells him that she is pregnant. They have an emotional, heart-to-heart conversation. Kate Rowan has to make a tricky climb on to a church roof to give aid to a badly injured lead thief. Music in this includes "We Can work It Out", "Na Na Na Na, Hey Hey, Kiss Him Goodbye", "Magic Bus".