Tearoom owner Lily Roberts leaves New England for old England to attend a party for an aristocratic centenarian—but what goes on there is anything but noble.
Long ago, Lily's grandmother Rose worked as a kitchen maid at Thornecroft Castle, and now Elizabeth, dowager countess of Frockmorton, is celebrating her hundredth birthday. Rose still has fond feelings for her onetime employer, so a group trip to Yorkshire is planned. It's also an opportunity for Lily to visit her boyfriend, who's currently working in England.
Much has changed, however, and the ancestral home is now a luxury hotel, which will be closed for a week to accommodate the big bash, much to the chagrin of Elizabeth's grandson, Julien—leading Lily to overhear an argument among the younger generation about the fate of the family fortune. Little do they know that Elizabeth plans to sell the famous Frockmorton Sapphires out of the family.
The icing on the cake comes when the jewels vanish—and things really go nuts when a party guest dies from an allergic reaction to almonds that someone smuggled into Lily's coronation chicken sandwiches. Now she'll have to scour the property to find out who would commit murder in such a manor.