`For God's' sake, Mason,' Sir. William said, in a low voice, 'how was he killed?'
General Mason drew a hand hard over his moustache and imperial. It was his only sign of nervousness. He said:
'It appears to be a crossbow bolt, from what I can judge. There's about four inches projecting from his chest, and the point barely came out the other…. Excuse me. A crossbow bolt. We have some in the armoury. Straight through the heart. Intantaneous death, Bitton. No pain whatever.'
`You mean,' said the chief inspector, `he was shot… '
`Or stabbed with it like a dagger. More likely the latter. Come and look at him, Mr Hadley and then take charge of my court he nodded towards the Tower behind him `in there. I'm using the Warders' Hall as a third degree room.’
`What about visitors? They tell me you've given orders nobody is to leave.'
`Yes. Fortunately, it's a bad day and there aren't many visitors. Also, fortunately, the fog is very thick down in the well around the steps of Traitors' Gate; I don't think a passer-by would notice him there. So far as I'm aware, nobody knows about it yet. When the visitors try to leave, they are stopped at the gate and told that an accident has happened; we're trying to make them comfortable until you can talk to them.'
Ahead of them the hard road ran arrow-straight. Towards the left, a little distance beyond the long arch beneath which they stood, Rampole could see the murky outlines of another round tower. Joining it, a high wall ran parallel with the road. And Rampole remembered now. This left-hand wall was the defence of the inner fortress; roughly, a square within a square. On their right ran the outer wall, giving on the wharf. Thus was formed a lane some twenty-five or thirty feet broad, which stretched the whole length of the enclosure on the riverside. For perhaps a hundred yards along this road General Mason led them; then he stopped and pointed towards the right.
`St Thomas's Tower,' he said. `And that's the Traitors' Gate under it.'
Traitors' Gate was a long, flattened arch of stone, like the hood of an unholy fireplace in the thick wall. From the level of the road, sixteen broad stone steps led down to the floor of a large paved area, which had once been the bed of the Thames. For originally this had been the gateway to the Tower by water; the river had flowed in at a level with the topmost steps, and barges had moved under the arch to their mooring. There were the ancient barriers, closed as of old: two heavy gates of oaken timbers and vertical iron bars, with an oaken lattice stretching above them to fill in the arch. Thames-wharf had been built up beyond, and the vast area below was now dry.