He found the sergeant attempting ineffectively to discover finger-prints on the smooth walls of the safe, sympathized with him in the difficulty of his task, and asked a number of deliberately futile questions. On the ground that nothing had been stolen he minimized the gravity of the affair, questioned his power to prosecute should the offenders be forthcoming, and instilled doubts into the other’s mind as to the need for special efforts to run them to earth. Finally, the man explaining that he had finished for the time being, he bade him good night, locked up the house and went to bed. There he lay for several hours tossing and turning as he puzzled over the affair, before sleep descended to blot out his worries and soothe his eager desire to be on the track of his enemies. Chapter III The Launch “Enid” For several days after the attempted burglary events in the Cheyne household pursued the even tenor of their way. Cheyne went back to Plymouth on the following morning and interviewed the manager of the Edgecombe, and the day after a quiet, despondent-looking man with the air of a small shopkeeper arrived at Warren Lodge and was closeted with Cheyne for a couple of hours. Mr. Speedwell, of Horton and Lavender’s Private Detective Agency, listened with attention to the tales of the drugging and the burglary, thenceforward appearing at intervals and making mysterious inquiries on his own account. On one of these visits he brought with him the report of the analyst relative to the dishes of which Cheyne had partaken at lunch, but this document only increased the mystification the affair had caused. No trace of drugs was discernible in any of the food or drink in question, and as the soiled plates or glasses or cups of _all_ the courses were available for examination, the question of how the drug had been administered—or alternatively whether it really had been administered—began to seem almost insoluble. The cocktail taken with Parkes before lunch was the only item of which a portion could not be analyzed, but the evidence of the barmaid proved conclusively that Parkes could not have tampered with it. But in spite of the analysis, the coffee still seemed the doubtful item. Cheyne’s sleepy feeling had come on very rapidly immediately after drinking the coffee, before which he had not felt the slightest abnormal symptoms. Mr. Speedwell laid stress on this point, though he was pessimistic about the whole affair. “They know what they’re about, does this gang,” he admitted ruefully as he and Cheyne were discussing matters. “That man in the hotel that called himself Parkes—if we found him tomorrow we should have precious little against him. However he managed it, we can’t prove he drugged you. In fact it’s the other way round. He can prove on our evidence that he didn’t.” “It looks like it. You haven’t been able to find out anything about him?”