On the terraformed planet of Pax Caledonia, sixteen-year-old Kelli now has her dream horse, and she has named him Thunderbolt. He is a one of a kind horse, bonded to her through blood, genetics, and "essence." This isn't just an animal; it's a friend tailored to a one of a kind bond. A living marvel of power and grace with a "flowing obsidian mane" and a coat like shining silk. Thunderbolt's arrival, and his deep connection to Kelli, arouse the indigenous Tunda beings of Pax Caledonia to take action, and seek new links to their spirit realm. To do this, they have made it clear, Kelli and her prize horse are the spiritual conduit.