"He seems to have been an impulsive man, who acted on the spur of the moment," Merrick answered; "but the strangest part of that is, that he did not return to the city at all. He bought a ticket for New York, but the conductor informs me there was no such man on board; while the north-bound train, which pulls out about five minutes later, had a passenger answering exactly to his description. The conductor on the latter train also informed me that, just as they were pulling out of the station, a man, tall and dark, rather good-looking, he should judge, though he could not see his face, and wearing a long, light overcoat, sprang aboard, decidedly winded, as though from running, and immediately steered for the darkest corner of the smoking-car, where he sat with his hat well drawn down over his face."
"Carroll again, by George!" exclaimed the attorney.
"Here is a problem for you to solve," Merrick continued, pointing to the revolver and box lying side by side. "You think Brown threw those in the lake. Who was the man that Brown saw standing beside the lake just before three o'clock in the morning, and what was he doing? He was tall and dark, and wore a long coat or ulster. Was that Carroll or Carruthers? Did he throw anything into the lake? And if so, what?"
Mr. Whitney gazed dubiously at the detective for a moment, then began to whistle softly, while he slowly shook his head.
"No, Merrick; you've got me there! I never have had enough experience in this line that I could go into the detail work. I have to be guided by the main points in the case. Then, again, I gave Brown's testimony very little thought, as I considered him unreliable and irresponsible."
"Well, to come back to the 'main points,' then: what reasons have you for connecting Mrs. LaGrange and Hobson with this affair that might not apply equally well in the cases of certain other people?"
"What reason? Why, man alive! there is every reason to consider Mrs. LaGrange the instigator of the whole affair. In the first place, her one object and aim for the past seventeen or eighteen years has been to get hold of Hugh Mainwaring's property, to secure for herself and her son what she calls their 'rights'—"
"That is the point," Merrick interrupted. "You consider her guilty because she would be interested in securing a hold upon the property, although she, personally, has no claim whatever. Has it never occurred to you that there might be others more deeply interested than she, inasmuch as they have valid claims, being the rightful heirs?"
"I never thought of such a possibility," said the astonished attorney; "and I don't know that I understand now to whom you refer."
"I have learned from various reliable sources," the detective replied, "that Ralph Mainwaring has a younger brother, Harold, who is as much of a money-lover as himself, though too indolent to take the same measures for acquiring it. He is a reckless, unprincipled fellow, and having about run through his own property, I understand, he has had great expectations regarding this American estate, depending upon his share of the same to retrieve his wasted fortune. I learned yesterday, by cable, that since the departure of Ralph Mainwaring and his family for this country, his brother has been missing, and it is supposed, among his associates in London, that he took the next steamer for America, intending to assert his own claims."