Simon Thorn and the viper's pit

Summary/Review: "Simon Thorn only recently discovered that he's an Animalgam--one of a secret race who can shift into animals. Now, for the first time in his life Simon has real friends to train and study with at the secret Animalgam Academy. The only missing part is his mother, held captive by his evil grandfather, Orion, who's bent on taking over the animal world"--