In the world of Erdas, only a rare few are able to summon a spirit animal in the way Conor, Abeke, Meilin, and Rollan have. The bond they share with their animals is a partnership that allows them to access more-than-human abilities.

But what if there was another way to create a spirit animal—to force the bond, giving the human partner total control? And what if someone with selfish intensions was offered this gift . . . with a catch.

The four young heroes have barely had time to come together as a team, and their own spirit animal bonds are still greatly untested. But now they face a brutal confrontation against an enemy who will break any rule to defeat them.