Annie Haynes' 'The Blue Diamond' is a classic murder mystery that showcases her talent for weaving intricate plots and creating compelling characters. Set in the early 20th century, the novel follows the investigation of a stolen blue diamond and the mysterious deaths that follow. Haynes employs a suspenseful narrative style, keeping readers guessing until the surprising conclusion. Her attention to detail and ability to create a realistic, atmospheric setting contribute to the book's enduring appeal in the mystery genre. 'The Blue Diamond' stands out as a quintessential example of Golden Age detective fiction. Haynes' clever use of red herrings and unexpected twists sets her apart as a master of the genre. In addition to the engaging mystery plot, the book also offers insight into social norms and class distinctions of the time period.