Hazel Green is a free spirit - independent, mischievous and charming. She lives on the 12th floor of the grand old Moodey Building. Once a year, on Frogg Day, the whole city celebrates with a fabulous parade, and Hazel is determined that the children of her building will join in. But some of the grown-ups want to keep them out - especially troublesome Hazel. And then Hazel is falsely accused of stealing. But nothing troubles Hazel for long. With her humour and resourcefulness - and unexpected help from a reclusive boy called the Yak - she wins everyone around.