Finn MacCool is not happy. His dad has been missing since he was a baby and he has grown too tall to be on the basketball team anymore. So when his mum wins a lottery prize and organizes a trip to her native Ireland, Finn isn't too pleased. All he can think about is what could go wrong. In the little village of Kilclooney, County Donegal, Finn is curious when his giant of a great-grandfather gives him a wrinkly old bag full of Celtic relics and tells...