Undine

Two things must be known about Undines, aquatic beings in feminine form; first, they can only attain an immortal soul by marrying an earthly man. Second, if Undine's love is betrayed, she must kill the unfaithful man. When the knight Hugo falls in love with Undine, it seems that happiness is perfect at last, the wedding bells ring, the village rejoices and celebrates. But then Bertalda appears and the lake's water level ominously begins to rise.