"What a hard and disagreeable experience," exclaimed Clara, "and so strange too! You have no occasion to reproach yourself, Mr. Litizki, with any neglect. You did all that any man could do, I am sure, and it may not prove to be unfortunate that Poubalov saw that you were watching him."

"I wish I could think so," responded the tailor, "and it is wonderfully kind of you to be so patient with my failure. Isn't there something that I can do now? I can do no work until this matter is settled, and it is torture to remain idle."

"I know how true that is," sighed Clara; "yes, there is something I think you can do. If Poubalov had not called last evening, and so changed all our plans, I should have asked you to follow Billings when he left the house. I have little faith in him, Mr. Litizki, and it seems to me that on leaving here last night he must have gone directly to report to his accomplice, or employer. Are you sure that Poubalov spoke to nobody?"

"If he did, it was no more than a passing word. He seemed to know no one."

Clara had to stop and think, for Litizki's story tended to upset her theories concerning Poubalov's exit and his relations with Billings. Could it be possible, after all, that Billings had not been employed by the spy, and that the latter, therefore, had had nothing to do with Ivan's disappearance? Perhaps Poubalov worked through still another accomplice, and, suspecting possible treachery, had been at the pains of secretly following Billings, to learn whether he and the unknown other were faithful.

This seemed rather a wild supposition, for it would not be like Poubalov to admit others into his secret operations.

Had he followed Billings? There was no doubt in Clara's mind that this was what he started to do when he leaped over the hedge and ran to the side of the road opposite to where Billings was walking. Had Poubalov lost Billings in the darkness, and, observing Litizki's pursuit, purposely dodged hither and thither, to discomfit the tailor?

From every question Clara turned more puzzled than before. It must be that she was on the wrong track, else a reasonable answer could be found, a reasonable explanation suggested for every act. Perhaps she was wrong in obstinately connecting Poubalov with the first act in the tragedy, the disappearance of Ivan; but if so, could his conduct even then be explained?

"Mr. Litizki," said Clara, at length, "I want to know all that can possibly be learned about this man Billings. He gave me his address. Will you undertake to look him up? Unless he is very closely in league with Poubalov, he will not know who you are, and for that matter it probably won't be necessary for you to meet him. Eventually you might have to follow him somewhere, but at the start you might learn a great deal from his neighbors."