Christmas is near and Kate Rowan has arranged that Danny Parkin, who is very ill, gets home from hospital during the holidays. A trip to a sanatorium in Switzerland will do wonders for him and to earn money for the trip his siblings "borrows" Christmas trees from Lady Whitly's estate in order to sell them. The snobby, but very attractive Lady Whitly shows a lot of affection for PC Rowan, who is sent to investigate, and she is also involved in the local Christmas charity concert. The same concert needs a Santa Claus and a reluctant Greengrass is hired for the job. Not surprisingly he tries to make money on the deal. And speaking of Greengrass, somebody has nicked his lorry!

Brian Rider buys his first car at Marsden Motor Co. and like all young men he likes it sporty and fast. When the proud new car owner takes his vehicle for a fast spin he loses control and collides with a stone wall. His mother blames Marsden for selling her son a defective car. But it is destroyed by fire before forensics can have a look at it. And that is not Marsden's only trouble. His wife has been caught shoplifting on several occasions and it turns out that she has been beaten as well. PC Bradley thinks Marsden is behind both incidents. Greengrass has bought a couple of racing pigeons and wants everybody to buy shares. But it appears that even Greengrass does not know everything about racing pigeons.