The Seven Secrets - William Le Queux - Bog

Dr. Ralph Boyd is on a mission to find the murderer of wealthy old Mr. Henry Courtenay. It is certain that only someone who lived in the victim's suburban London home could have entered his room unnoticed. Thus, Boyd has some prime suspects to consider: Is he one of the servants? Or the victim's young wife, or perhaps her attractive sister with whom the victim has fallen in the love? A thrilling investigation awaits Boyd where nothing is as simple as it appears...