Hans Jürgen Deponte

An encounter with a blind man ends unexpectedly for Susan Howard. The supposedly helpless man stuns and kidnaps her. The case is handed over by the Home Secretary to Sir John, the head of Scotland Yard. He entrusts Chief Inspector Higgins and Superintendent Lane with the investigation. Their investigations quickly lead Higgins and Lane on the trail of murder, white slavery and blackmail.

To gain lands from the prince of Saxony, a group of orphans seeks Mozart, in order to obtain the very rare score of one of his compositions.