Bruno is convinced that aliens are invading Dog City. Eliot decides to take this as a cue for this next Ace Hart Adventure. Eliot sends Ace on a high-flying adventure to the moon to find out what happened to Arfstrong, the first mutt on the moon, who disappeared soon after he landed. Once there, Ace gets tangled in a web of espionage that includes both Rottweiller and Bugsy and a cat named Bestov Breed. Who will claim the moon first?
—Anonymous