An even stranger little adventure for the redoubtable Hilda in this volume - the hidden people want to evict Hilda and her Mum from the valley where they live in apparent isolation. It turns out to be a lot more crowded than they thought. Aside entirely from the invisible folk, there's the mysterious giant who lurks behind the mountain every night. Can Hilda sort things out with the hidden people and solve the mystery of the giant? Beautiful, cute, charming and funny, with a somewhat unexpected ending.