CBS has been given the contract to guard a building site - a derelict church which is due to be demolished and replaced with luxury flats by a local builder, Donald Bannerman. During a violent thunderstorm, there is an earth movement and some ancient statues are uncovered. Dr Freda Butler, an archeologist at the university, insists on being given access, saying that the statues date back to the time when there was a Cistercian monastery on the site. Bannerman refuses, but Ken decides to let her have a quick look at the statues while Bannerman isn't there.

During the night, one of Bannerman's JCBs is sabotaged when sand is poured in the fuel tank. Freda and her students are blamed. Bannerman threatens to hand over the security contract for guarding all his sites to Jack Fentiman, one of Harry's rivals. Harry wants to sack Frank, the security guard who was on duty at the site. However Ken feels sorry for Frank, who is the rather simple brother of another CBS guard, Bertie, and insists on