Rill is sent to the city to serve his apprenticeship as a soother's boy, one who calms the animals known as ravings after their powerful magic has been taken from them by the beastmasters. But the magic factory is full of mystery and danger, with rituals and rules that often seem to Rill not only pointless but cruel. As his confusion mounts and his troubles multiply, the soother's boy can trust just one person - his fellow apprentice Challi, a young girl who is his only friend in the entire city. Together, Rill and Challi are about to uncover the last, terrible secret of the Beasthole.