This time, what greeted them was a solid-seeming stone wall. But Sir Pierre pressed in on one small stone, and a section of the wall swung back, exposing a stairway. "Oh, yes," Darcy said. "I see what he did. This is the old spiral stairway that goes round the inside of the Keep. There are two doorways at the bottom. One opens into the courtyard, the other is a postern gate through the curtain wall to the outside—but that was closed up in the sixteenth century, so the only way out is into the courtyard." "Your lordship knows Castle D'Evreux, then?" Sir Pierre said. The knight himself was nearly fifty, while Darcy was only in his thirties, and Sir Pierre had no recollection of Darcy's having been in the castle before. "Only by the plans in the Royal Archives. But I have made it a point to—" He stopped. "Dear me," he interrupted himself mildly, "what is that?" "That" was something that had been hidden by the arras until Sir Pierre had slid it aside, and was still showing only a part of itself. It lay on the floor a foot or so from the secret door. Darcy knelt down and pulled the tapestry back from the object. "Well, well. A .28 two-shot pocket gun. Gold-chased, beautifully engraved, mother-of-pearl handle. A regular gem." He picked it up and examined it closely. "One shot fired." He stood up and showed it to Sir Pierre. "Ever see it before?" The Privy Secretary looked at the weapon closely. Then he shook his head. "Not that I recall, your lordship. It certainly isn't one of the Count's guns." "You're certain?" "Quite certain, your lordship. I'll show you the gun collection if you want. My lord the Count didn't like tiny guns like that; he preferred a larger caliber. He would never have owned what he considered a toy." "Well, we'll have to look into it." He called over Master Sean again and gave the gun into his keeping. "And keep your eyes open for anything else of interest, Master Sean. So far, everything of interest besides the late Count himself has been hiding under beds or behind arrases. Check everything. Sir Pierre and I are going for a look down this stairway." The stairway was gloomy, but enough light came in through the arrow slits spaced at intervals along the outer way to illuminate the interior. It spiraled down between