When newly divorced mom Dahlia (Jennifer Connolly), rents an apartment, it looks like a new start for her and daughter Ceci (Arial Gade). But it's an uphill battle with ultra-creepy maintenance man Veeck (Pete Postlethwaite) and the apartment's owner (John C. Reilly) to get a nasty, recurring water leak in her ceiling fixed and Dahlia soon finds herself and her daughter pulled into a horrific journey of discovery with the apartment upstairs – and its long gone tenants - taking center stage.