The Castlecourt Diamond Mystery

"The Castlecourt Diamond Mystery" by Geraldine Bonner is an early 20th-century mystery set in London, where the dazzling Castlecourt diamond necklace vanishes from the possession of the Marchioness. Sophy Jeffers, the lady's maid, finds herself at the center of the ensuing chaos when the precious heirloom disappears from Burridge’s Hotel amid preparations for a grand event. As detectives arrive to investigate, a complex web of suspicion ensnares not only Lady Castlecourt but also the enigmatic housemaid, Sara Dwight, revealing secrets, social tensions, and hidden agendas among the elite. The story unfolds with each clue, suggesting the theft involves far more than a simple robbery, as potential accomplices and deeper motivations come to light.