The Third Floor 2: Suicide House. The Angel Hill novels, #6

The Angel Hill Bed and Breakfast is open for business. Your home away from home, amenities include private rooms, free wi-fi, home-cooked meals, and whispers in your ear at night, The Lonely Man urging you to join him forever. Just use the straight razor conveniently placed in the bathroom for you. Or the gas oven. Or there's rope in the basement. Or you can drown yourself in the claw foot tub. The possibilities for a sad and lonely death are endless.
Milo Dengler, the Lonely Man, is still wandering these rooms, and now he wants company._ _ _When Liz Kitch watched Angel Hill disappear in her rearview mirror twelve years ago, she thought that was the last she'd see of this cursed town and the house on Fourth Street. But now, with her husband gone, strange forces are pulling her back to Missouri and the town that has haunted her dreams ever since.
The Angel Hill Paranormal Investigation Society has been seeking the truth in this town for years. So far, every case they've tackled has seemed like so much fluff compared to what they're about to face in the famous house on Fourth Street. Who will survive their stay in the most haunted house in Angel Hill, and who will join the Lonely Man?