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 s 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.

Preparations for the Ghastly-Gorm Garden Party and bake-off are under way. Celebrity cooks are arriving at the hall for the big event and, true to form, Maltravers, the indoor gamekeeper, is actng suspiciously. Elsewhere at Ghastly-Gorm Ada's wardrobe-dwelling lady's maid Marylebone the bear has received a marriage proposal. Ada vows to aid the course of true love and find out what Maltravers is up to, but amidst all this activity.