Owen, Dana, Jon, and Sydney must find a crystal rune before Norse trickster Loki uses its power to destroy their world.

Owen Brown is your average fourth grader. Or he was, until his best friend, Dana, disappeared right in front of his face, through the floor of the school. Owen's average life has turned upside down. He's determined to find Dana -- before anyone realizes she's missing. Owen sets out on a mysterious, mythological rescue mission with his friends Jon and Sydney. But what none of them know is that Dana's disappearance is part of a much larger riddle. And...

Edda, the littlest Valkyrie, leaves the magical land of Asgard to attend school in hopes of making a friend her own age, but feels like an outcast until she finds her courage and learns that being different makes her special.