The mortal instruments, the graphic novel

"Maia and Simon are kidnapped, and Jace knows exactly who took them. It's time to face the terror known as Valentine to stop him from slaughtering the Downworlders and activating the Soul-Sword. All the Shadowhunters gather to join the fight, but when they find themselves hopelessly outnumbered by thousands of demons, the fate of the world might just lie in Clary's hands...!"--Back cover.