Platnéřský mistr Tomáš má mladou ženu Alenu, na kterou velmi žárlí. Jednoho dne Alenu spatří pán města a rozhodne se, že ji získá pro sebe. Aby měl volnou ruku k milostným pletkám, pošle mistra Tomáše na zkušenou do Flander. Žárlivý manžel si neví rady jak zajistit počestnost půvabné manželky po dobu své nepřítomnosti a nakonec přijme pomoc čerta, kterému za odměnu upíše duši...

Master armourer Tomás has young wife Alena, of whom he is very jealous. One day the ruler of town sees Alena and decides to win her over for himself. To get a free hand for his love affairs, he sends Master Tomás to acquire more skills in Flanders. Jealous husband does not know how to secure fidelity of his beautiful wife while he is away, and finally accepts aid of the devil, to whom he signs his soul as a reward. Devil in the disguise of Master Ondrej works in Tomás's workshop and protects Alena against various courtiers and the ruler of town. But finally he falls in love with Alena himself and becomes her lover.