If the vow-bound love between Huldbrand and Undine—and the way it’s strained by Bertalda and Kuhleborn’s meddling—hooked you, you’ll be swept up by the selkie wives of The Brides of Rollrock Island. Misskaella calls seal-women from the surf, and the men who claim them face the same heartbreak and moral reckoning that follow Huldbrand from the forest cottage to Ringstetten. The sea’s pull, the cost of betrayal, and the aching beauty of union across worlds echo Undine’s fate in an island setting you can practically taste on the wind.

If you felt the tension of Undine’s marriage—blessed by a priest yet shadowed by ancient powers and Huldbrand’s wavering—Uprooted offers a similarly charged bond. Agnieszka’s uneasy apprenticeship to the Dragon deepens into a complicated devotion, all while an ancient Wood presses in as relentlessly as Kuhleborn’s waters. The push and pull between human promise and otherworldly claim, from country cottage to lordly halls, mirrors the emotional storm that drives Undine and Huldbrand.

If you loved the way Undine’s world runs on omens, blessings, and a river spirit’s caprice—Kuhleborn rising from wells and waves—The Last Unicorn will feel kindred. Schmendrick’s wayward spells, the unicorn’s transformation into Lady Amalthea, and King Haggard’s surf-beaten fortress create that same shimmering, rule-light enchantment. Like Undine returning from the waters to claim a broken vow, the story turns on love and loss shaped by magic that answers more to destiny than to laws.

If Fouqué’s flowing cadences and courtly mood drew you in—from the misted forest cottage to Castle Ringstetten—Dunsany’s lyrical sentences will enchant you. Alveric weds Lirazel of Elfland much as Huldbrand weds Undine, and the rift between faerie nature and human custom widens with every page. The language itself shimmers like moonlight on water, carrying the same elegiac beauty that made Undine’s love and fate unforgettable.

If Undine’s quest for a soul—and Huldbrand’s moral failing that summons her from the fountain—lingered with you, Phantastes offers a kindred, symbol-rich pilgrimage. Anodos wanders Fairy Land, haunted by a shadow and drawn to the Marble Lady, meeting wood and water spirits whose meanings unfold like parables. The Christian undertones and nature’s living presence echo Undine’s baptismal blessing, her river-kin’s warnings, and the grave cost of broken fidelity.