The witch and day-walking demon Rachel Morgan managed to save the demonic timelessness from destruction, but at a high price. Now strange magic attacks Cincinnati and the Lowlands, causing spells to backfire or go horribly wrong, and the truce between the Inlander and Human races is shattered.  Rachel must stop the undead vampire masters from losing the control they use to keep the remaining undead within limits. If they lose control, there will be an all-out supernatural war. However, the only way to prevent them from losing control is to use ancient elven wild magic, which itself is dangerous.