Save his boy, uncover a conspiracy, and master opposable thumbs-a dog's work is never done. Buddy's favorite thing is curling up for a nap at the foot of Ethan's bed. Then he stumbles through a portal to a clockwork city plagued by chimeras, and everything changes… Well, not everything. Sure, his new human body comes with magic powers, but he'd still rather nap than face the people of Excelsior, who harbor both desire and fear when it comes to "the other side." He discovers Ethan followed him through the portal and underwent his own transformation, and it becomes Buddy's doggone duty to save him. Buddy finds unlikely allies in an aristocrat with everything on the line, a mechanic with something to hide, and a musician willing to do anything to protect her. Using a ramshackle flying machine, the group follows the chimeras deep into the forest and uncovers a plot that could reshape the worlds on both sides of the rift.