“That’s proof positive,” said ingenuous Mr. Upton, under his breath.
“Well, I confess it’s something like it in this case; but it was a very awkward moment for me. I hadn’t to let him see I knew him, nor yet that I was following him, and the only way was to abandon the chase as openly as possible. It was then I decided that it was no use leaving poor old Mullins in pawn to the police. I redeemed him without delay. We went back to my new rooms together, which I needn’t tell you I liked so much that I brought a suit-case and took them for a week. Of course, as we had lost the run of Baumgartner, the next best thing was to watch for his return. Mullins took that on while I got some sleep; when I awoke the Park Lane murder was the latest, and I won’t say I didn’t suspect who’d done it. Perhaps I didn’t tell you he had his camera with him as well as beard and goggles, and all three figured in the first reports.”
“But all this time you had no idea my boy was in the house?”
“None whatever; we saw the girl once or twice, but that was all until I wired last night. What I never saw myself was Baumgartner’s return; but in the afternoon I sent Mullins round to another road to try and get a room overlooking the place from the back. Well, the houses were too much class for that; but one was empty, and he got the key and risked going back to prison for the cause! Suffice it that he set eyes on both man and boy before I sent that wire.”
“And you left my son in that murderer’s clutches a minute longer than you could help?” It was a previous incarnation of Pocket’s father that broke in with this.
“You must remember in the first place that I couldn’t be in the least sure it was your son; in the second, if murder had been intended, murder would have been done with as little delay in his case as in the others; thirdly, that we’ve nothing to show that Dr. Baumgartner is an actual murderer at all, but, fourthly, that to raid his place was the way to make him one. Poor Mullins, too, as the original Sherlock of the show, was desperately against calling in the police under any circumstances. He assured me there was no sign of bad blood about the house, until the small hours, and then he saw your son make his escape. I told him he should have collared the lad, but he lost sight of him in the night and preferred to keep an eye on that poor desperate doctor.”
Thrush treated this part of his narrative with the peculiar confidence which most counsel reserve for the less satisfactory aspects of their case. But Mr. Upton was not in a mood to press a point of grievance against anybody. And the name of Mullins reminded him that his curiosity on a very different point had not been gratified.
“Why on earth did you have Mullins run in?” he inquired, with characteristic absence of finesse.
“I’m not very proud of it,” replied Thrush. “It didn’t come off, you see.”
“But whatever could the object have been?”