Twelve-year-old supernatural sleuth Dotty Morgan becomes embroiled in an ancient conflict between rival factions who both want the Japanese sword her father gave her as a birthday present. The timing couldn’t be worse. She’s navigating the complications of middle school romance with her girlfriend, Hannah, and dealing with her mother who asks Dotty’s former bully to move in. To keep safe the people she loves, Dotty investigates a four-hundred-year-old murder even though undead ninjas, winged tengu, and a demon known as an oni stand in her way.