No One Lives In 6b. The Bellweather Residences, #4

Every building has a room it pretends doesn't exist. Kayla Monroe is an ER nurse and a single mother clinging to the fragile terms of a conditional custody agreement for her six-year-old daughter, Hazel. The last thing she needs is trouble. But late one night in her luxury Chicago apartment at the Bellweather Residences, she hears something impossible through the brass air vent in her daughter's bedroom: a child coughing.
According to the building's floor plans, the management, and the wealthy residents, the adjacent unit-Apartment 6B-is just an empty mechanical space. But behind the plaster, a seven-year-old boy named Sam has been living in a sealed room for eighteen months. He counts tiles to stay sane, reads library books, and has been told by the uncle who keeps him locked away that his mother is dead. Using her clinical precision to unravel the building's darkest secret, Kayla uncovers a chilling family conspiracy.
Sam's grandparents and his calculated uncle haven't just hidden a child-they have fabricated a web of fraudulent documents, forged medical records, and institutional silence to erase his past. Now, the family knows Kayla is asking questions. They know about her custody record, and they know exactly how to use the legal system to take Hazel away if she speaks up. To save the boy in the wall, Kayla must risk everything she has fought to keep.