Being the O'Donnellan heir and a leprechaun means that Prospero Clydesdale O'Shaughnessy can talk to fairy tale creatures, has a few tricks up his sleeve for dealing with the school bully, and can do some leprechaun magic-though it usually makes him puke. But it also means that with the help of the gnomes who live in his backyard, a living enchanted suit of armor named Sir Nigel, his tomboy best friend Sadie, his faithful dog Chelsey-One-Eyed-Jack,...