The Devil's Apprentice (Volume 1 of The Great Devil War)

Philip is a good boy, a really good boy. So he doesn’t understand why he’s suddenly in Hell, handpicked to be the Devil’s successor. The Devil, too, quickly realizes that a mistake has been made, but he still needs to begin Philip’s training in the ways of Evil—and to bring out his dark side. Philip quickly makes friends and enemies in this odd, gloomy world. Meanwhile, he discovers an evil-minded plot against the dark throne…

The Devil’s Apprentice is volume 1 of The Great Devil War-series (Middle Grade)