Based on the magazine stories "In a Muddle" and "Heroes."

Bill and Ben mistrust a group of trucks into telling them how to set up things at the harbour station causing confusion and delay. However, they become heroes after saving the workers when a rock-slide suddenly strikes the clay works.

Thomas and Percy are not happy about dividing the jobs of mail-delivery and visiting the Mountain Village for Christmas, but things are worse for everybody when they find out that the village is cut off by snow.