Treachery Queen (The Callistra Chronicles #1)

It is two thousand long years into the future. There is no more Earth. There is only Callistra. Since the conclusion of the fae civil war that decimated the human population, there has been a strained peace among the surviving mythical creatures. But now, a strange fae illness is spreading across Callistra, and the era of harmony is crumbling fast. Pasiphae of Eo has been framed. Her grandmother, the most powerful witch in Eo, has fallen sick, and Pasiphae is suspected to be responsible. Forced to flee her homelands for treason against her coven, the only way to clear her name is to find the true traitor. Pasiphae has no choice but to venture deep into unknown territory with help from one of the fae. He can help her find the cause of the illness from within the Unseelie Court, where the walls talk and the shadows move, and she can do for him what the fae cannot do themselves: lie. But a conspiracy is unravelling in this foreign land swathed under perpetual night. All Pasiphae wanted was to prove her innocence, but within the heady darkness of the malevolent faery court, there is love and betrayal so potent it could ruin the world a second time.