Penny was right: the sky is falling. When an iron acorn falls from the clouds and nearly cracks her beak, Penny-a Rhode Island Red with zero patience for nonsense-realises her farm is in trouble. But she isn't just a bird on a mission; she's an asset. Snatched from the dirt and carried into the clouds, Penny finds herself trapped in a silver castle that is literally falling apart. The giants who live there are nomads-parasites who plant magic beans to suck the life out of the earth below. And they need Penny's golden eggs to refine that stolen energy before their floating kingdom crashes. Teamed up with a cynical, one-legged rooster and a singing harp with a mysterious past, Penny must decide: will she keep her head down and lay the gold, or will she lead a barnyard rebellion to save the earth from the giants above?