From back cover: When a legendary jewel, the Thistle of Scotland, vanishes from the bride's coiffure at her wedding breakfast, Sherlock Holmes is summoned--in the strictest confidence. The exquiste amethyst is the sole dowry of the impoverished Earl Mowbray's daughter, Lady Caroline. If the centuries-old piece is not found, the marriage will be annulled.
As the police busy themselves interrogating footmen and intimidating kitchen maids, Holmes and Watson uncover clue after clue. Yet Holmes confesses himself baffled by the odd plethora of evidence: the strange condition of the books in the Earl's library...the making of tea at a Lady's charity society...a pair of check trousers that no gentleman--or even gentleman's gentleman--would wear. Every avenue leads back to the proud and silent Lady Caroline. But, when she, too, disappears, Holmes must make haste if he is to save a lady's honor-and his own reputation!