Bath, England, 1892. Celebrated mystery author Lady Amy Lovell is set to tie the knot with Lord William Wethington, a fellow member of the Mystery Book Club of Bath. Amy's great-aunt, Lady Priscilla Granville, has offered to host their wedding at her stately Derby Manor House. But on the eve of the ceremony, the festive air in the drawing room is marred by Mrs. Finch's argument with her husband in another room. The next morning at the wedding breakfast, Mrs. Finch falls face-first into her breakfast - dead. When Amy and William's favourite detectives are summoned to the house, they see two champagne glasses in front of Mrs. Finch and none in front of her husband. Did Albert give his wife a poisoned drink? Lady Amy is not convinced that Albert is guilty.