A young man named Friedrich, from humble beginnings, gains his employer's attention and begins tutoring his son. As he spends more time with the family, he becomes deeply attached to the employer's wife, Lotte. Despite being separated when Friedrich is sent to Mexico for two years to oversee a mining project, the couple swears to remain faithful to each other. However, the impending war prolongs their separation, testing their devotion.

A Promise
A wife's devotion is challenged in 1920s Germany as she finds herself drawn to her husband's young protégé, whose arrival sparks a powerful and illicit attraction.