Elizabeth St. Clair: Secret of the Locket

Secret of the Locket was published in June 1975 and is about Deirdre Camden who took a job at St. Ambros Hill in archaeology and assist Keith Powell, who may not be what he seems.

This cover by Allan Kass is interesting because of the dimensions. He definitely made the haunted house the focal point and the heroine lesser. I like the eerie green color and the leaning, bare trees. It's good and spooky!