Inspector Fords raid on the Marmon Flats block opposite Roland Fletchers block, led him to the discovery of a jewel thief operation so he decided to participate. Two of the gang made off to Amsterdam. They were dressed exactly alike. On the crossing over to the Hook of Holland the Grey Goose brought his piano wire in to play and lowered himself over to have a peek in to the port hole of their cabin. Then he heard Barbara scream out from her cabin. What could have caused her to scream...