To their left was a larger gate leading to the causeway that served as the Tower’s main land entrance, but it had been closed and locked for the night. And indeed, as soon as the last of their group had made it across the drawbridge, the postern gate was closed behind them, and locked by a middle-aged bloke in a night-cap and slippers. Daniel had enough Tower lore stored up in his brain to suspect that this would be the Gentleman Porter, and that he must live in one of the flats that abounded in this corner of the complex. So they were locked in for the night.