Magnus Bane, a centuries old High Warlock, has taken possession of one of the great relics of the supernatural world, a powerful spell book of dark magic known as The Book of the White and there are many who want to claim it for themselves.

After the Mortal War where the part-human and part-angel Shadowhunters teamed with the part human-demon Downworlders to fight against the incursion of an army of demons, Magnus and his new lover, the mortal Alec Lightwood celebrate their survival and victory by escaping the supernatural battlefield of New York City by touring the world, but the world won’t leave them alone.

The first adult novel set within #1 New York Times bestselling author Cassandra Clare’s Shadowhunter series, written with award-winning science fiction author Wesley Chu, is a fantasy thriller that will give new readers a great way to enter the Shadowhunters world and give the millions of readers across the globe answers they’ve been looking for in this start of The Eldest Curses trilogy.