Master of Fiends is the sequel to Blade 3579 of the Poisoner, in which the boy Jarral is sentenced to death by a wound from an enchanted sword and meets the three heroic friends who eventually save his life. The wizard Cryl is captured by the forces of evil at the end of this book, and so the four friends' quest to save him is carried on in Master of Fiends.

Most of Hill's previous works for young people have been science fiction.

The books include the ColSec Trilogy: Exiles of ColSec, The Caves of Klydor, and ColSec Rebellion, as well as a set of five books about an intergalactic warrior named Keill Randor. Most of Hill's books feature young people in challenging settings, facing powerful villains and fantastic monsters. Most of these books are brisk, readable adventures with much action and suspense.

They often deal with...