Amina, an orphan of a village in the Swiss Alps, is engaged to Elvino. Elvino has decided to marry another woman after wrongly believing Amina was unfaithful to him. While sleepwalking, Amina remembers the engagement ring that he took from her when he believed she was unfaithful to him. In her distress, she walks precariously over a roof in the village square. Believing her innocence, Elvino takes her in his arms and places the engagement ring back on her finger at which time she awakens and expresses her joy.
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