Revenge of the One-Trick Pony (Xander and the Rainbow-Barfing Unicorns)

The secret of the Rainbow-Barfing Unicorns is out and that makes Xander Stone sick! Twelve-year-old Xander is the only person on Earth who knows about the Rainbow-Barfing Unicorns. Except, of course, for a rich and crazy billionaire who will stop at nothing to capture these zombielike, upchucking creatures and get even richer and crazier!