Pursuit - Pursuit of the Limehouse Killers

Inspector Peter Black receives a call in his office from Sargent Clive Fernus (aka Clive Roach), Scotland Yard's inside man on the illegal narcotics business.  Clive tells him that the head man of the narcotics ring was named Jackman, but someone has just bumped him off.  Also, unfortunately, the narcotics have not been located.  At this point, Clive tries to warn Inspector Black about something, but he cannot because someone is coming near.  For over a year, Scotland Yard has worked on this case, and it has been one of the cleverest and most sinister active narcotic rings in the British Isles.