“That’s one of the troubles we are up against,” Quest admitted. “We have to remember this, though. The brain that planned the two murders here, that stole and restored Mrs. Rheinholdt’s jewels, that sends us those little billets-doux from time to time, is quite capable of finding a way out of a jerry-built garage.”

The Professor sniffed. He turned once more to Lenora.

“Young lady,” he said, “I will ask you this. I do not wish to seem obstinate in my refusal to accept Craig’s guilt as proved, but I would like to put this simple question to you. Did Craig’s demeanour during your conversation seem to you to indicate the master criminal? Did he seem to you to be possessed of supreme courage, of marvellous intelligence?”

Lenora smiled very faintly.

“I am afraid,” she replied, “that this time I’ll have to satisfy the Professor. He was white and trembling all the time. I thought him an arrant coward.”

The Professor smiled beatifically as he glanced around. He had the air of one propounding an unanswerable problem.

“You hear what Miss Lenora says? I ask you whether a man who even knew the meaning of the word fear could have carried out these ghastly crimes?”

“I have known cases,” Quest observed, “where the most cold-blooded criminals in the world have been stricken with the most deadly fear when it has come to a question of any personal danger. However,” he added, “here comes our friend French. I have an idea that he has something to tell us.”

They glanced expectantly towards the door as French entered. The Inspector, who was looking very spruce and well-brushed, wished them a general good-morning. His eyes rested last and longest upon Laura, who seemed, however, unconscious of his presence.

“Now, then, French,” Quest began, as he returned his greeting, “take a cigar, make yourself comfortable in that chair and let us have your news. As you see, we have obeyed orders. We are all ready to follow you anywhere you say.”