London, 21 September 2001: In the murky waters of the Thames, a passer-by discovers the lifeless body of a 5-year old child of African origin, from which the arms, legs and head have been removed. For Scotland Yard this discovery sparked the most intensive and most unusual murder investigation ever conducted by its officers in its long history. Information from a unique police unit specialising in occult crimes in Pretoria, South Africa lead investigators to deduce that the boy had been sacrificed in a ritual murder of a type which, up to this, had been practised predominantly in southern Africa. These mysterious "muti" murders are an extreme form of occult belief: the body parts or blood of a killed person are ingested as a "muti medicine“ or buried, in order to grant another person health, power, wealth or strength. As the documentary follows the enormous and exhaustive investigation conducted by Scotland Yard, it attempts to establish the links between the historical, religious and criminological backgrounds to occult aggression and a specific form of ritual murder.