AllMovie

In this detective mystery based on the novel Kronvittnet or Experiment in Murder by Maarten Hart, a respected scientist is suspected of murder when a young woman who has recently visited his laboratory is discovered to be missing. Police detective Lambert (Gosta Ekman) investigates the case, and finds plenty of evidence of the visit, but no body. He also finds clues that lead him to suspect that the scientist's laboratory is a front for a drug ring's manufacturing plant.