In Hillytown Biscuit Church and the Custard Cream Communion Club, Nancy becomes curious about different Christian churches. The churches in Hillytown work together happily and put on joint Fun Days, so how come they once burned each other at the stake?

Then three new children turn up at the Hillytown Biscuit Church Sunday School. They seem to spoil everything, and even make life hard for their teacher, Beryl. What should the gang do? Start a secret club and keep them out, declare war on the back path, or can they find a better way to live together?