Following the butler's death and the cook's retirement, the ever-gullible Lady Lavinia replaces them with a power couple who are determined to thrust the crumbling estate into the 21st century.

The Dowager Countess reluctantly agrees to hold a big-ticket Christmas gala and silent auction with a mystery celebrity flying in from Monaco as the guest of honour. Needless to say the newcomers' make a few enemies in their quest to change the status quo and when one body is discovered in the Victorian stumpery and a second, in the ha-ha, it seems that their high-flying past is catching up with them. Meanwhile, Kat is dealing with the theft of a valuable doll that had been earmarked for the auction.

When it turns out that all the ticket money has vanished and there never was a celebrity guest, it's up to Kat to save the day and bring the cold-blooded killer to justice.