The Null Faeries #4

Delving ever more deeply into the mystery of the missing pixie dust shipment, Ionantha Hesperis, the only mortal faerie and the Queen's inquisitor, must at last confront the first adult human to sense the faerie world and command its magic since Merlyn, over a thousand years ago. In doing so, she walks alone, and plays a desperate game of cat and mouse with the most dangerous threat the Fey world has ever seen.