The three misfits Mark, Memo and Becky discover a fantastic world called The Black Tower where the Gryphon, a world-devouring monster, mercilessly subjugates all living creatures. And Mark is the only one who can defeat it. But he's no hero and doesn't want to be one. He has enough to do with school, his tantrums and his first love. Fighting monsters is out of the question. But when Mark's brother Thomas disappears, the friends have to set off into this fantastic world and face the danger.