He determined to sound her guardian.

    "Mr. Farrington," he asked aloud, "what do you think—hallo!" He sprang up suddenly and thrust out a supporting arm.

    Farrington had risen, and stood swaying slightly upon his feet. He was frightfully pale, and his countenance was contracted as if in pain. He lifted a wavering hand to his head.

    With a supreme effort he steadied himself.

    "Doris," he asked quickly, "I meant to ask you—where did you leave Lady Constance?"

    The girl looked up in surprise.

    "I haven't seen her to-day—she went down to Great Bradley last night—didn't she, auntie?"

    The elder woman nodded.

    "Mannish, and not a little discourteous I think," she said, "leaving her guests and motoring through the fog to the country. I sometimes think Constance Dex is a trifle mad."

    "I wish I could share your views," said Farrington, grimly.

    He turned abruptly to Doughton.

    "Look after Doris," he said. "I have remembered—an engagement."

    He beckoned Frank, with a scarcely perceptible gesture, and the two men passed out of the box.

    "Have you discovered anything?" he asked, when they were outside.

    "About what?" asked Frank, innocently.

    A grim smile broke the tense lines of Mr. Farrington's face.

    "Really!" he said, drily, "for a young man engaged in most important investigations you are casual."

    "Oh!—the Tollington business," said the other. "No, Mr. Farrington, I have found nothing. I don't think it is my game really—investigating and discovering people. I'm a pretty good short story writer but a pretty rotten detective. Of course, it is awfully kind of you to have given me the job——"

    "Don't talk nonsense," snapped the older man. "It isn't kindness—it's self-interest. Somewhere in this country is the heir to the Tollington millions. I am one of the trustees to that estate and I am naturally keen on discovering the man who will relieve me of my responsibility. There is a hundred pounds awaiting the individual who unearths this heir."

    He glanced at his watch.

    "There is one other thing I want to speak to you about—and that is Doris."

    They stood in the little corridor which ran at the back of the boxes, and Frank wondered why he had chosen this moment to discuss such urgent and intimate matters. He was grateful enough to the millionaire for the commission he had given him—though with the information to go upon, looking for the missing Tollington heir was analogous to seeking the proverbial needle—but grateful for the opportunity which even this association gave him for meeting Doris Gray, he was quite content to continue the search indefinitely.

    "You know my views," the other went on—he glanced at his watch again. "I want Doris to marry you. She is a dear girl, the only human being in the world for whom I have any affection." His voice trembled, and none could doubt his sincerity. "Somehow I am getting nervous about things—that shooting which I witnessed the other night has made me jumpy—go in and win."

    He offered a cold hand to the other, and Frank took it, then, with a little jerk of his head, and a muttered "shan't be gone long," he passed into the vestibule, and out into the foggy street. A shrill whistle brought a taxi from the gloom.

    "The Savoy," said Farrington. He sprang in, and the cab started with a jerk.

    A minute later he thrust his head from the window.

    "You may drop me here," he called. He descended and paid his fare. "I'll walk the rest of the way," he remarked casually.

    "Bit thickish on foot to-night, sir," offered the driver respectfully. "Better let me set you down at the hotel." But his fare was already lost in the enveloping mist.

    Farrington wrapped his muffler closely about his chin, pulled down his hat to shadow his eyes, and hurried along like a man with a set destination.

    Presently he halted and signalled to another cab, crawling along close to the curb.

    

    

CHAPTER V

    

    

    The fog was still heavy, and the blurred street-lamps looked ghastly in the yellow mist, when the little newsboy messenger, the first half of his mission performed, struck briskly riverward to complete his business. He disposed of his papers by the simple expedient of throwing them into a street refuse-bin. He jumped on a passing 'bus, and after half an hour's cautious drive reached Southwark. He entered one of the narrow streets leading from the Borough. Here the gas lamps were fewer, and the intersecting streets more narrow and gloomy.

    He plunged down a dark and crabbed way, glancing warily behind him now and then to see if he was being followed.

    Here, between invisible walls, the fog hung thick and warm and sticky, crowding up close, with a kind of blowsy intimacy that whispered the atmosphere of the place. Occasionally, close to his ear, snatches of loose song burst out, or a coarse face loomed head-high through the reek.

    But the boy was upon his native heath and scuttled along, whistling softly between closed teeth, as, with a dexterity born of long practice, he skirted slush and garbage sinks, slipped around the blacker gulfs that denoted unguarded basement holes, and eluded the hideous shadows that lurched by in the gloom.

    Hugging the wall, he presently became aware of footsteps behind him.