James, the young fiancé of Effie, is napping by the fireplace. A Sylph appears – she easily flutters at James and awakens him with a kiss. James tries to catch the Sylph, but she suddenly disappears. The young man is overwhelmed with thoughts of fantastic visions.
The witch Madge, who came to predict the future for the youths, foretells that James will not marry Effie. The young man drives away the witch. He leaves with bitter anger. During the wedding, the Sylph appears again, but only James sees her. The Sylph snatches the young man’s ring and disappears. James, abandoning Effie, runs after her.