Reynolds, Aaron, 1970- Incredibly dead pets of Rex Dexter (Series) #3

Ever since he was cursed by an old carnival game, Rex Dexter has had the ability to communicate with ghostly animals, and this time he is confronted by a roomful of magicians' rabbits who are suddenly dead and want to know why; the Astounding Isabel tells him that the problem was her malfunctioning magic hat, but she cannot understand why it keeps happening--and soon Rex and his friend Darvish are neck deep in dead bunnies, and a mystery that just keeps getting more confusing with every passing day

Ages 8-12