A noise downstairs : a novel

"Paul Davis is hearing some very strange noises in the night. He hears the clickety-click of a manual typewriter-- as if someone is vigorously tapping the keys. The eerie sounds began soon after his wife, Charlotte, bought him a classic antique Underwood. But only Paul can hear the noise coming from downstairs; Charlotte doesn't hear anything unusual. Is Paul losing his mind? Maybe. Or is something really there? Eight months ago, he stumbled upon...