Mr. Henry Courtenay is an old and wealthy member of London's elite with health problems is found dead in his bed. However, his illness doesn't seem to be the cause of his death and his main servant claims he was murdered. Dr. Ralph Boyd, the beloved of Mr. Courtenay's sister-in-law, who was present at the house in the time of the mysterious murder, involves his friend detective Ambler Jevons, and they pursue an independent inquiry. Suspects are few, but as the investigation moves forward, Boyd and Jevons are facing secrets and mysteries at every corner. William Le Queux (1864-1927) was an Anglo-French writer who mainly wrote in the genres of mystery, thriller, and espionage, particularly in the years leading up to World War I. His best-known works are the anti-French and anti-Russian invasion fantasy "The Great War in England in 1897" and the anti-German invasion fantasy "The Invasion of 1910."