What happens when Pitch Black lets out his secret involving the details of how he ties to Jack Frost's past? What about when Jack realizes his sister who he saved long ago is actually alive as a spirit of summer? When Jack has to protect both himself and more importantly his sister from Pitch Black, even more secrets are spilled, one of which involves the horrible truth that Pitch Black is actually the brother of Jack frost and Emma Summer. As the danger gets too much for comfort, man in moon is forced to take drastic measures to save Jack and Emma. He turns both the spirit of winter and spirit of summer into Half Mortals, Half immortals. They are able to get sick, be seen by everyone else, feel injury, and yet have their immortality and powers. After realizing they are in need of a place to stay, Mrs. Bennet or Jamie's mother accepts Jack and Emma into her home after hearing about how Jack saved her son. Read this story, Mortal or Immortal, to figure out just how Jack and Emma remain safe and defeat their long lost brother at the same time. Will Jack find it within himself to destroy the brother he once looked up to? Read to find out!