A powerful warlock and a fierce demon-hunter must journey into the heart of evil but first, they need a babysitter. Life is finally peaceful for Magnus Bane and Alec Lightwood. They are living together in a fabulous New York loft, and their warlock son, Max, is just learning to walk. But their quiet life shatters when two old acquaintances break in and steal the legendary Book of the White. To get it back, Magnus and Alec must drop everything and track the thieves all the way to Shanghai. With Clary, Jace, Isabelle, and Simon joining them as backup, they soon discover a terrifying threat: demons are flooding the city, and Magnus's magic is growing dangerously unstable. To stop the invasion, they may have to follow the dark magic back to its source in the realm of the dead. Can they save the world and make it home before their toddler destroys the apartment?