Lurline
Lurline, a Rhine nymph, falls in love with Count Rudolph. After he loses his engagement to Ghiva, Lurline gives him a magic ring and brings him to her underwater palace. Rudolph misses his former life and returns to the surface with Rhine treasure, promising to come back. Ghiva steals and throws away his ring, and Rudolph forgets Lurline. When his friends plot to murder him for his wealth, Lurline returns the ring and calls on the Rhine spirits. The flood drowns the conspirators, while Rudolph is spared and returns with Lurline to her palace.