"Aren't you giving her rather short notice, sir?" said Denny doubtfully.

Drummond laid down his pen and stared at him sadly.

"Sometimes, Denny, I despair of you," he answered. "Even after four years of communion with me there are moments when you relapse into your pristine brain wallow. If I gave her any longer it is just conceivable—though I admit not likely—that I might get my answer from her stating that she was completely unaware of my existence, and that she'd sent my letter to the police. And where should we be then, my faithful varlet? As it is, I shall arrive at Drayton House just after the letter, discover with horror that I have made a mistake, and be gracefully forgiven by my charming hostess as befits a man with such exalted friends. Now run away and get me a taxi."