PC Rowan responses to an anonymous emergency call and find archaeologist Professor Brigstocke dead in his library and the house broken into. The professor was said to hide a treasure and Greengrass decides to find it. Clues lead to the ruins of Saint Columba's Abbey on the Ashfordly estate. But also Mary Secker, who is writing a book on 12th century monasteries, is interested in the ruins. Lord Ashfordly is hosting a fishing party and is not pleased to find fishing net and no fish in his river. Blaketon suspects Greengrass is behind it and when the old scoundrel enters the abbey to look for the treasure, Blaketon is close behind him. They both get trapped and Blaketon breaks a leg when part of the ruins cave in, and Greengrass lights a fire to keep him warm.

Lots of different things have been stolen in Aidensfield over the years, but an entire train loaded with crates of wine must be a novelty. Whoever stole the wagons had access to a locomotive and enough space to hide the whole train. They must also have enough knowledge about railways to operate a train. When a wagon load of tobacco is coming through the police decide to use a similar wagon full of police officers as a decoy. Helen Trent has started the proceedings to get divorced from her husband and Gina invites her to a girl's night out to cheer her up. Phil also invites Rob out to a boy's night out to cheer him up after the break between him and Clare. They all end up at the same nightclub and decide to make it a foursome. The annual green bowling tournament is coming up. Bernie has his heart set on winning, but his main rival Bickerstaff will stop at nothing to get the trophy. Aunt Peggy takes over the catering and she needs a blackboard for the menu (yeah, right).