How not to win friends
Here’s the thing
It is far harder for people who are not used to keeping secrets to keep a secret from someone who has been trained to uncover them.
Whilst David had been to the castle before, there seemed to be new people there, as well as those he remembered, and he took an instant dislike to some. The estate manager, the construction manager, and the cook.
Perhaps the cook was possibly the wrong person to get on the wrong side, but David never had any qualms about rubbing people up the wrong way. If only he could shoot her and get away with it.
A private tour of the estate would require the subtle sidelining of his shadow, whom he discovers is really part of the surveillance team, and a secret way in and out of the castle, not all that hard because all castles have secret, and not so secret, passageways, and this was no exception. The construction within the castle walls turns out to be useful camouflage.
But, like any sortie under the eyes of the enemy, he nearly gets caught.
And cops a rebuke from Susan when his shenanigans are reported.
Not that he learns any real intelligence from what seems to be run-of-the-mill repairs and enhancements, though the new stables seem to be much bigger and more sophisticated than he would have thought necessary.
But Susan does like riding, and the estate is large enough to indulge that passion.