After Tabby Simon's father is found dead while researching a tree that leaks a mysterious mist in her neighborhood, she becomes determined to uncover the truth about what really happened to him. She finds herself transported to Rema, a distant world of magic and beauty that is periodically invaded by a nearby planet desperate for resources, and meets a mysterious blue-haired boy named Philip. Philip promises to help Tabby get home, and she soon discovers her destiny is intertwined with Rema.