The inquiry begins when the driver of "Lady Lebanon" (Helen Haye) turns up dead, having been choked with one of her costly silk scarves; Scotland Yard detective "Tanner" (George Merritt) and his somewhat clumsy partner "Totty" (Ronald Shiner) are then called to her estate. It doesn't take much time before a number of people emerge as possible perpetrators in the death of this unpleasant man, including regular guest "…