A cheap apartment. A desperate tenant. A rule no one survives breaking. When Nia Mercer rents a dirt-cheap studio in Blackstone Arms, she tells herself it is only temporary. The building is old, the neighbors are strange, and the lease is packed with bizarre warnings, especially one that makes no sense at all: rent must never remain unpaid past midnight. At first, the sounds in the walls seem like the ordinary groans of a dying building. Then a tenant falls short. Then another disappears. As Nia digs into the truth, she discovers that Blackstone Arms is not just a bad address. It is a machine built on debt, fear, and something old enough to have outlived every name the building has worn. Trapped inside with a landlord who treats horror like property management, Nia must decide whether to play by the rules or tear the whole structure down before the thing inside the walls learns her completely. Rent Is Due at Midnight is a fast, claustrophobic apartment horror novel perfect for readers who love sinister buildings, escalating dread, and one-sitting nightmares.