A storm traps eight guests inside the Harlow House Hotel, a remote country retreat where the roads are cut off, the phones are down, and one man is found dead in Room 4B with the door locked from the inside. Nora Vass only came to the hotel for a quiet escape. Instead, she finds herself pulled into a chilling locked-room mystery filled with blackmail, buried secrets, and impossible lies. As she questions the guests one by one, the truth begins to surface: the wife knows more than she admits, the business partner is hiding financial damage, the travel writer arrived with a hidden grudge, and a young man has come searching for a father who never claimed him. But the deepest secret of all is still locked inside Room 4B. Atmospheric, tense, and twist-filled, The Guest in Room 4B is a dark psychological mystery where every guest has a motive, every answer raises suspicion, and the truth is waiting behind a door that should never have been locked.