Animal spirits, the Unseen, are tired of being ignored by humanity and so they orchestrate a devastating war amongst the humans, forcing humanity to once again turn to the spirits in need. Once or twice a generation, a human is born with a strange condition known as the lacking: they only possess half a soul. Some among the Unseen are drawn to fill the lacking with their own spiritual presence, allowing them to influence the human’s thoughts and actions, but this traps the spirits as well for as long as the chosen human lives. Two such humans, Rye and Junah, are young men outcast from society and unable to return. Swept up in the plans of the Unseen, they unwittingly start a war in their journey for revenge on those responsible for their solitary states and for a companionship that they didn’t realize they needed.