The Phantom Lights — James H. Rhodes

As Anna Bradshaw drove to Seawind, a big stone house on the ocean, she looked forward to a vacation of sunshine, swimming, and fresh sea air. She did not know about the persistent rumors of phantom lights in the house -- or what they meant. She was not prepared for the nightmares that would soon invade her sleep, or the sinister invisible presence that would haunt her waking hours.

Life at Seawind would have been impossible if not for David Stevens, the attractive artist who lived next door. It was because of David that Anna stayed at the house when common sense told her to flee. She hoped he'd protect her from any real trouble. But what if David was the biggest danger of all?