Bestselling author Karen Marie Moning returns with the epic conclusion to the thrilling Fever series, where a world thrown into chaos becomes more volatile at every turn. Mac, Barrons Riodan and Jada fight to maintain control, enemies become allies, right and wrong cease to exist, and the lines between life and death, lust and love disappear without a trace. Black holes loom menacingly over Dublin, threatening to destroy the Earth. Yet the greatest threat is what McKayla Lane has let off her leash - the Sinsar Dubh, a sentient book of unthinkable evil, has taken over her body and will stop at nothing in the insatiable weather for power. The fate of humans and Fae depends on the destruction of the book and the restoration of a long-lost Songs of Creation, the only magic that can restore the fragile fabric of the Earth. But to achieve this, the sidhe-seers, the Nine, the Seelie and the Unseelie must form unexpected alliances and make heartbreaking decisions. For Barrons and Jada, this means finding the Seelie Queen (she alone can use the mysterious song), negotiating with the deadly Unseelie Prince (who is hell-bent on ruling the Fae Court), and figuring out how to destroy the Sinsar Dubh while sparing Mac's life. No achievements this time. no casualties, no pursuit without risk, no victory without irreversible loss. In the battle for Mac's soul, every decision exacts a huge price.