In Darkroom - Tödliche Tropfen , cult director Rosa von Praunheim focuses on a true crime story that occurred in Germany recently, and the result is one of his most thrilling films. Lars, a male nurse from Saarbrücken, moves to Berlin with his lover, Roland. They begin to renovate an apartment and their happiness seems almost complete. What Roland doesn’t know is that, while secretly checking out Berlin’s night life, Lars is also experimenting with a deadly poison.