Synopsis: Looking for a fresh start, a young taxi driver moves into apartment 504 of a crumbling tenement. He soon discovers the previous tenant died mysteriously and everyone on the floor is somehow connected to the dead man. After befriending the battered wife living a few doors down, he stumbles into an affair that sends them both down a dark path. But there's something else odd about the atmosphere in the run-down building. Does a ghost haunt those living here, or does true evil exist in those left alive?