No common officer will do.

We have one of that kind in the building.

What we want is a man of brains; he will need them." A muffled sound at the other end--then a different voice asking some half-dozen comprehensive questions--which, having been answered to the best of the Curator's ability, were followed by the welcome assurance that a man on whose experience he could rely would be at the museum doors within five minutes.
With an air of relief Mr.Jewett stepped again into the court, and repelling with hasty gestures the importunities of the small group of men and women who had lacked the courage to follow the more adventurous ones upstairs, crossed to where the door-man stood on guard over the main entrance.
"Locked ?" he asked.
"Yes, sir.

Such were the orders.

Didn't you give them ?" "No, but I should have done so, had I known.