Goth girl and the ghost of a mouse

"Meet Ada Goth. She lives in Ghastly-Gorm Hall with her father, Lord Goth, lots of servants and at least half a dozen ghosts, but she hasn't got any friends to explore her enormous, creepy house with. Then one night everything changes when Ada meets a ghostly mouse named Ishmael. Together they set out to solve the mystery of the strange happenings at Ghastly-Gorm Hall. And get a lot more than they bargained for..."--Back cover.