Jamie Carthage is just a normal 14-year-old boy, who just recently moved to New York. Apparently, however, he is the Joiner, a person who will combine the magic worlds together to save the world. Joined by a surprisingly hot nerd, a talking shoe, the most popular kid at his new school, and his 5-year-old sister, Rose, Jamie just might have a chance at saving the world. Also, HP&MR