Jennifer by Moonlight — Clarissa Ross

Lucy Dorset came to Moorgate as the happy bride of a dedicated young doctor. But she soon discovered that the old stone house was inhabited by a pale and lovely ghost, a victim of a fatal romantic triangle long ago. Was she imagining her husband's sudden jealous moods?

And a rival for his affections in sultry Sheila Farley?

Lucy feared that the unhappy spirits of Moorgate were pushing her toward a reenactment of a violent, century-old tragedy. She realized that she alone must rid the house of the menacing presence that threatened her marriage.