The Adventures of Alec and Spyro book 3

Nearly 3 years after Alec created his portal to the Dragon Realms, he had managed to redesign and perfect the technology...mostly. But now, the details of the Dragon Realms seem to be altering from his own knowledge. Now in the form of a silver dragon, Alec and the others try to protect a gravid Cynder while a new threat arises. But is the threat as obvious as it appears?