Oona has found a very special egg. She'll do anything to protect this egg until it hatches. Then she can find out what's inside, even though it might just gobble her up! Little brother Thunk, smelly Bruce Brute, and other grimy Cro-Magnony hands in her West Wog world, all want Oona's treasure. More than anything, Oona wants something of her very own to care for.