Rose Campion and the Christmas mystery

It's pantomime season at Campions' Palace of Varieties and Wonders - but Rose Campion and her friends have more to worry about than who'll be filling the role of Cinderella. The Duchess - the deadly ruler of the London criminal underworld - has been released from prison, and she has her sights set not only on Rose, but also on a pricesless emerald necklace that has just arrived in the city. Meanwhile, Campions' is playing host to the mysterious hypnotist Madame de Valentina - but how is she able to communicate with the souls of departed loved ones - before they've died?