Adastra tells the story of a human who has been kidnapped from Earth by a well-meaning but impulsive alien wolf named Amicus. The wolf is royalty in his home world of Adastra and is competing with his younger brother Cassius for control of the Wolven imperial throne. Amicus, who finds himself unable to amend his mistake and bring the main character back to Earth, strikes a deal. If the human can help improve his chances of winning the emperorship by posing as a sapient "pet," considered a status symbol for royalty, then Amicus will in turn use the power that comes with the throne to find a way to bring him back to Earth. Their secret gambit leads Amicus and the human to become much closer to one another, and their relationship develops from one of necessity into something much fonder. As the trust between them grows, however, their trust in the others who live in the palace falters, and the intensifying battle for the throne begins to reveal that everyone, from the lowest servant to perhaps even the gods themselves, may have a hidden agenda. With danger rising, the bond between human and wolf is put to the ultimate test while Adastra's fate hangs in the balance.