Lord Ashfordly's sister is in the area but is causing Nick havoc with her drink driving. He handles it tactfully at first until she nearly causes an accident. Patricia is outraged when he brings her into the station, but after Lord Ashfordly had a quiet word with Blaketon he lets her go without charge. Nick is angry at the special treatment she received and later has a row with Jo when she tells him she'd rather go riding with Patricia than spend Saturday with him. Patricia's problems come to a head and she tries to kill herself but is rescued in time. Nick and Jo make up and have an exchanging of apologies and all is well by the end of the episode.

Bellamy convinces Bradley to have a party at the Aidensfield Police Station. Lord Ashfordly's sister visits to introduce her new love, but he's very interested in Gina, and Greengrass has campers who modernize people's homes.

Jackie gets a visit from her old friend Caroline. She is surprised to learn that Caroline has a baby. Caroline needs a day off from motherhood and leaves the baby with Jackie and Mike while she goes to York to see some friends. Mike leaves the baby in a pram outside the police house, but when Jackie comes home from an errand the baby is gone. Jackie is not the only one who has a visitor. Lady Patricia visits her brother at Ashfordly Hall together with an old family friend Lord Hal Tadcaster. Well "together" may not be the proper word, because she would rather see him leave than stay. And with good reason since the CID suspects Tadcaster of being a drug dealer and asks the police in Ashfordly to keep an eye on him. The post office in Whitby goes on strike. Vernon Scripps gets the idea to start a courier service. And for once he does the dirty work himself.

Things get complicated for Steve when he falls for the beautiful daughter of a Polish violinist staying at Ashfordly Hall. Vernon is visited by two long-lost cousins claiming to have an irresistible business proposition.