Friday is baking day in Struay, when everyone bakes their special treats - everyone that is except Mrs McColl who, unlike Mr McColl, is not a good cook. Mr Mackie the new teacher and his wife, who is an expert baker, are coming to tea but Katie Morag's mother has written down the wrong date so there's nothing prepared, and Mr McColl is away in Glasgow! Katie Morag tries to help her mother out of the dilemma in her inimitable way - with the help of a few others!