Ferran's Map (The Cat's Eye Chronicles #4)
by T. L. Shreffler
The bloodmage Volcrian is dead, but a new enemy lurks in the shadows. The Shade, a fanatical cult of demonic assassins, is trying to resurrect the Dark God and unleash His power back into the world. In their wake, a deadly plague is spreading across the land. Sora and her companions are the only ones who know of the plague’s true source, and must stop it before it's too late.