Josslyn Hay was a British aristocrat who moved with his wife, Lady Idina Sackville, to Africa. There, they were part of the “Happy Valley Set,” a group of wealthy expats who lived to drink alcohol, do drugs and have sex. Extra-marital affairs at their parties were not only common but openly encouraged. So when Josslyn Hay was found miles from his home, slumped in the front seat of his car, dead of a gunshot wound, virtually everybody in their social circle was a suspect.