In this picture book, as Dad tucks his daughter into bed, he tells her fantastically imaginative stories about the keys on his key ring and what they unlock - from a zippenburger that takes him to work, to a rocket to collect space noodles, a treasure box in the jungle, a chocolate biscuit factory where he taste tests all the biscuits, and a paddock where he rides a woolly mammoth that only eats yellow food.