It is the run-up to Christmas, and Leo and Penny are investigating the mystery of a Christmas gift left in a 'safe place' as mentioned on the back of a WW2 wedding photo. Meanwhile, Leo's son Daniel has come to stay for the festive season, there have been a spate of petty thefts in Salthaven, snow is falling thickly, the vicar's wife is perilously close to giving birth and Terry Durham is trying to buy up the Salthaven Boating Society clubhouse land so he can build a tourist marina.