All Magnus Bane wanted was a vacation.

A lavish trip across Europe with Alec Lightwood, the Shadowhunter who, against all odds, is finally his boyfriend. It doesn't seem like too much for the centuries-old High Warlock to ask for. But no sooner have they settled in Paris than an old friend arrives with news about a demon-worshipping cult called the Crimson Hand that is bent on causing chaos around the world.

Now Magnus and Alec must race across Europe to track down the Crimson Sand and its elusive new leader before the cult can cause any more damage. As if ti wasn't bad enough that their romantic getaway has been sidetracked, demons are now dogging their every step, and it is becoming harder to tell friend from foe. As their quest for answers becomes increasingly dire, Magnus and Alec have to trust each other more than ever--even if it means revealing the secrets they've both been keeping.

The first book in the Eldest Curses series from #1 New York Times bestselling author Cassandra Clare and award-winning science fiction author Wesley Chu, The Red Scrolls of Magic is a fast-paced adventure bursting with magic, humor, and (if demons stop getting in the way) romance that offers a fresh look at the world of the Shadowhunters.

This description comes from the publisher. The Red Scrolls of Magic is the first book of the Eldest Curses; this is part of the Shadowhunter world, the first book of which is City of Bones.