The Mystery Of The Green Heart is a novel written by Max Pemberton and published in 1910. The story revolves around the mysterious disappearance of a valuable emerald, known as the Green Heart, which belongs to a wealthy English family. The emerald is said to be cursed and brings bad luck to whoever possesses it.The main character, Horace Byrd, is a private detective who is hired by the family to investigate the disappearance of the emerald. Byrd...