If it's weird, if it's strange, if it's supernatural, the Ghost sisters love it. Kat and Marie Bench love ghosts. When their divorced mom moves them to her hometown in Colorado, the sisters discover a real specter haunts their school. The ghost of a young girl cries, slams lockers, and leaves mysterious messages in Hallway B. Armed with ghost-hunting tricks they picked up from books and TV, the resourceful sisters set out to find the identity of the apparition. Meanwhile, one of their friends is being bullied. Kat and Marie will need bravery and determination to help their friend and solve...