The arrival of a mysterious stranger forces Ellida Wangel to confront the suffocating constraints of her marriage and her deep-seated longing for the sea. Ellida, the lighthouse keeper's daughter, struggles with a sense of entrapment in her life with Dr. Wangel, a provincial doctor. Her internal conflict intensifies when a former lover, a sailor to whom she once pledged her soul, returns to claim her. The play utilizes a realistic framework to explore the psychological tension between domestic duty and the pull of an untamed, elemental past. The narrative unfolds through dialogue-heavy scenes that emphasize the characters' internal states over external action.

Discussion often centers on the play's departure from Ibsen's more overtly social dramas toward a more symbolic and psychological focus. Readers frequently highlight the ambiguity of Ellida's final choice, noting how it reflects the complexity of individual agency within societal structures. Critics often examine the atmospheric quality of the coastal setting, which serves as a mirror for the protagonist's internal instability. The play is frequently studied for its nuanced portrayal of marriage and the tension between security and the desire for liberation. Many readers find the pacing deliberate, allowing for a slow accumulation of psychological pressure that culminates in the final act.