Undine
By Friedrich Heinrich Karl La Motte-Fouqué
Cover: Ondine (Undine) (c. 1872), oil on panel by John William Waterhouse (1849-1917) · Wikimedia Commons · Public domain (artist died 1917)
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A knight falls in love with a foundling girl who is secretly a water-spirit, and the water makes its claims. Friedrich de la Motte Fouqué's 1811 fairy romance, here in Charlotte Yonge's English, a source for later tales of the sea-maiden.
Summary written with Claude Sonnet 5.5.