The Seven Secrets by William Le Queux

A true “whodunit” with as many twists and turns as an English country road. Old man Courtenay is found murdered in his bed. Dr. Ralph Boyd is summoned to Courtenay Manor to examine the slain man and discovers a clue that might solve the case. But, he decides to keep the clue private for personal reasons. In the meantime, Scotland Yard has no clues as the culprits or the motive. Dr. Boyd, because of his new found clue, is sure he knows who is the murderer. Or, is it a murderess? His intimate acquaintance, Ambler Jevons, is also investigating the crime but Dr. Boyd does not share his discoveries with him. Sure of his findings, a bizarre midnight encounter turns all Boyd's judgments upside down and the case becomes more peculiar than when it started. What are the seven secrets needed to decode this murder, or is it a conspiracy? One needs to listen to the end to discover the truth.