the Adventures of Carter and Last Dragon

Carter is a curious boy of about 12 who always enjoys visiting his grandfather whose attic is filled with many marvelous contraptions. One day, he's dropped off at his grandfather's house after his grandfather's funeral. Carter has the house to himself and goes exploring parts of the house his grandfather had forbidden. While looking around, he finds a strange wooden chest in the attic and opens it. When he does, Carter is transported to a world within the chest. In the alternate world, he almost immediately crosses paths with a dragon named Azi. Azi explains to Carter that humans should never enter the world of dragons and vice-versa because if they do, the two worlds might become permanently connected. Dragons would be free to roam and destroy the human world. The Adventures of Carter and the Last Dragon follows the travels of Carter and Azi in this new world.