The Infernal Instruments is a TMI, TID crossover. Where Henry creates a portal that can travel through space and time and he and the other Infernal Devices characters travel from London 1878 to New York 2013, where they meet the Mortal Instruments characters. The story is told from both Tessa and Clary's POV's

The Shadowhunters of London get sent into the future. There they meet Magnus, but a more sparkled version, and the modernized Tessa...she happens to be, well different from the Tessa they knew. They also meet The Shadowhunters from New York. As they struggle to get back to their time they discover many things.