Der grüne Domino.

The film The Green Domino is adapted from the 1933 stage play Der Fall Claasen by German dramatist Erich Ebermayer, whose works often examined criminal cases and moral dilemmas. Ebermayer's play, premiered at Vienna's Akademietheater, centers on a mysterious figure linked to a green domino mask during a pivotal event, blending elements of intrigue and personal reckoning.