Cassandra Clare The Eldest Curses 2 Books Collection Set (The Lost Book of the White, The Red Scrolls of Magic)

The Lost Book of the White:
Magnus Bane and Alec Lightwood are settling into domestic life with their son Max when the warlocks Ragnor Fell and Shinyun Jung break into their loft and steal a powerful spell book. Realizing that Ragnor and Shinyun are being controlled by a more sinister force, Magnus and Alec set out to stop them and recover the book before they can cause any more harm. With the help of Clary Fairchild, Jace Herondale, Isabelle Lightwood, and Simon Lovelace (who is fresh from the Shadowhunter Academy), they track the warlocks to Shanghai.

The Red Scrolls of Magic:
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. But as soon as the pair settles in Paris, an old friend arrives with news about a demon-worshipping cult called the Crimson Hand that is bent on causing chaos around the world. A cult that was apparently founded by Magnus himself. Years ago. As a joke.