I didn't hear anything." Valentine touched the electric bell, and his man appeared.
"Any one in with you to-night, Wade ?" he asked.
The man looked surprised.
"No, sir; certainly not, sir." "Oh! Don't sit up; we may be late to-night.

And we don't want anything more, except--yes, bring another couple of sodas." "Yes, sir." He brought them and vanished.

A moment later they heard the front door of the flat close.

The butler was married and slept out of the house.
Valentine had no servant sleeping in the flat.

He preferred to be alone at night..