Phylum is a brilliant young biologist born to lead the last of humanity, but his status comes with certain expectations. In a rare act of defiance, Phylum secretly joins a new scientific expedition up to the surface where mutation has infected everything. However, when his ambition almost costs him his life, he finds something extraordinary:

A human girl living on the surface.

Despite her animalistic traits, Canopy is remarkably intelligent, compassionate and even charming. She offers to help him with his research, but as they explore the vibrant paradise above, Phylum can’t help but question the disturbing nature of his home and the role he plays in it...