Certainly there were the two inspectors of police--one at Hampstead, and one at Blackheath--who were deeply interested in the respective deaths of Moon and Durwin. They would have been delighted to discuss the entire business threadbare in the hope of solving the mystery of the two crimes. But Dan did not wish to bring the police into the matter until he had more evidence to go upon. After all, what he knew concerning Mrs. Jarsell and Penn was both vague and uncertain, while the clue of the perfume being so slight might be scouted as ridiculous by these cut-and-dried officials. What Halliday wished to do was to establish a connection between the doings at Sheepeak, Blackheath, and Hampstead on evidence that could not be questioned, so that he might submit a complete case to the police. He could not do this until he acquired positive proof, and he desired to acquire the same by his own endeavors supplemented by those of Laurance. Therefore, as Freddy was away on business, and Dan did not care about placing his unfinished case before the inspectors, he went about his ordinary affairs, waiting for his friend's return. This was all that he could do, and he did it reluctantly. A hint from Lord Curberry had evidently made Sir John more vigilant as regarded his niece. Dan called at the house and was denied an interview; he wrote a letter and received no answer; and although he haunted Bond Street and Regent Street, the parks and the theatres, he could catch no glimpse of Lillian. After three days of unavailing endeavor he went to Bedford and attended to the transfer of his aeroplane to Blackheath, bringing it up in the train personally. Then he put it together again, and took short flights in the vicinity of London, after repairing the damage done to the propeller. All the same, his heart was not in the business of aviation at the moment as the detective fever had seized him and he felt that he could not rest until he had solved the mystery of the two crimes. But at the moment, he saw no way by which he could advance toward a consummation of his wishes, and simply fiddled away his time until the return of Laurance. Then, after a threshing out of details, he hoped to make some sort of move in the darkness.