"And the taking of the photographs was merely a blind, after not finding it?" Kennedy queried, I cannot say much impressed by my theory.

"Perhaps," I acquiesced weakly, as we went out.

Instead of turning in the direction of Carton's immediately, Kennedy walked across the campus toward the Chemistry Building. At the laboratory we loaded ourselves with a large and heavy oblong case containing a camera and a tripod.

The Cartons lived in an old section of the city which still retained something of its aristocratic air, having been passed by, as it were, like an eddy in the stream of business that swirled uptown, engulfing everything.

It was an old four-story brownstone house which had been occupied by his father and grandfather before him, and now was the home of Carton, his mother, and his sister.

"I'm glad to see you," Carton met us at the door. "This isn't quite as classy a robbery as Langhorne's—but it's just as mysterious. Must have happened while the family were at dinner. That's why I said it was a robbery by a sneak thief."

He was leading the way to his study, which was in an extension of the house, in the rear.

"I hope you've left things as they were," ventured Craig.

"I did," assured Carton. "I know your penchant for such things and almost the first thought I had was that you'd prefer it that way. So I shut the door and sent William after you. By the way, what have you done with him?"

"Nothing," returned Craig. "Isn't he back yet?"