The Seven Secrets  (English, Paperback, Queux William Le)

It was murder!Despite wealthy old Henry Courtenay's steadily declining health, his death comes as a shock to those around him. It was murder, Courtenay's his manservant declares, and asks Dr Ralph Boyd to find the culprit. Only someone who lives in the Courtenay's London home could have gone into his room unnoticed. Could the murderer be one of the servants? Or perhaps Courtenay's young wife or her beautiful sister, with whom Boyd has fallen in love? Boyd is beginning to realize that in the Courtenay household, secrets lurk at every turn, and nothing can be taken at face value. "As a recounter of stories of mingled mystery and adventure, William Le Queux is certainly among the best living writers." The Athenæum