The Shiver of the Vampires (1971)

Blissful newlyweds Isle and Antoine stop off at a decrepit old castle in rural France to visit the bride's estranged cousins, only to receive shocking news. However, the distraught couple decides to spend the night in the gloomy, stone-walled manor, and soon, the suspiciously warm hospitality of two eerily seductive maids paves the way for mysterious incidences and spine-chilling encounters. Then, the missing lords of the château turn up for dinner, and the truth becomes stranger than fiction. Now, a pale late-night temptress claiming to be a friend thirsts for Isle's kiss, eager to unveil the secret of eternal life. Is sweet death the doorway to the ultimate freedom?