In the novel Evil Under the Sun, Chief Inspector Ridgeway is the senior officer at Scotland Yard in charge of drug investigations.
After Devon police found a box of heroin at Pixy's Cove on Smugglers' Island, Inspector Colgate consulted Ridgeway. Ridgeway was very interested in the news. He told Colgate that a lot of heroin had been coming into the country lately. Scotland Yard already knew who the small distributors were and also who ran the operation at the other end. But how the heroin came into the country was still the puzzle.