A virus breaks out across the world, causing those infected to begin regressing to a more animal-like state and body. Violent and aggressive, and yet not murderous, the infected are spreading quickly despite attempts to quarantine or destroy.
This is the story of one man, William, who discovers he is infected and his struggles to keep his sanity and his friends and family safe in this increasingly unfriendly world of equines. Of course, being infected, his fellow humans are hardly a sanctuary of safety.