He had lost me. In the shadowy room, a single blade of sun pierced between the curtains and struck across the room, where it caught and blazed up in a tray of cut glass decanters, casting prisms that flickered and shifted this way and that and wavered high on the walls like paramecia under a microscope. Though there was a strong smell of wood smoke, the fireplace was burnt-out and black looking and the grate choked with ashes, as if the fires hadn’t been lit in a while.
i dont think 'pierced between' really feels right but this is pretty nonetheless