Looking forward to graduating from her Edinburgh high school and finding herself at university, Comet forms a connection with a bad-boy newcomer from America whose bullying friends do not approve of their relationship.

When the witch twins, Claire and Luna, accompany their grandparents to Scotland, they enlist the aid of an army of ghosts to help save the castle of their grandmother's old friend.

"Twelve-year-old Lizzie Chu has lived with her Wai Gong (grandfather) in Glasgow since her parents died when she was a baby. But Wai Gong has been acting different lately. He spends a lot of time talking to his Guan Yin statue--the Chinese goddess of compassion, kindness, and mercy--at his altar and seems to be becoming more forgetful. Even the shared passion he and Lizzie have for their favorite show, Strictly Come Dancing, seems to be tailing off....