Flint Street school's class of seven-year-olds are about to perform their Nativity play in front of their families. Their overworked and stressed teacher, Missiz Horrocks, tries, largely in vain, to keep the children in check whilst the role of Mary is coveted by more than just the girl cast and the Innkeeper goes off script to liven up Joseph and Mary's traditional query on whether there is room at the Inn. The audience of parents then take centre stage and we see that the kids are more than just a chip off the old block as the children literally become their parents. There is even room for several Christmas carols whose lyrics might not be those traditionally sung at that time of year...