The Gesture, by Gil Brewer (epub/Kindle/pdf)
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Nolan has retired with his wife to a private island off the mainland. He did so because of lifelong jealousy—he can't stand the thought of other men being attracted to Helen. When a photographer from New York shows up one day to do a photo story about the island. Nolan becomes convinced that he is having an affair with Helen—and begins to plan a murder...