Maria, a young student sees her brother Dieter going to prison for sedition against the state. She starts an affair with Paul, a judge who turns out to be the one who sentenced her brother, which eventually leads to a confrontation.
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.
