"The 13th Reality Series" is a young adult fantasy book series written by James Dashner. It follows the adventures of a teenager named Atticus "Tick" Tack who discovers a hidden world filled with strange creatures and alternate realities. The series explores themes of friendship, bravery, and the battle between good and evil. The story begins with Tick receiving mysterious messages that lead him to a parallel universe known as the Realities. Throughout the series, he encounters various characters, including Master George and Sophie, as they work together to confront the dark forces threatening their worlds.