THE WHODUNIT COLLECTION: British Murder Mysteries (15 Novels in One Volume). Charles Norris Williamson

let you know my movements. Fear the police may tamper with your correspondence, but later on when hue and cry has died down will let you know all.'"

      The two detectives looked at each other.

      "A barge below Tower Bridge," repeated Green, with something like admiration. "That was a good shot. He might have stayed there till doomsday without our hitting on him, or any one taking any notice of him."

      "I don't know," said Foyle. "A newcomer on the river would attract attention. These water-men know each other. There's only one way that I can see in which he would avoid being talked about. He is a watchman."

      "You're right, sir," agreed the other emphatically. "This is a matter where Wrington of the Thames Division will be able to help us. Hope we can find him at Wapping. Shall I ring through?"

      "There's no hurry for a minute or two," said Foyle. "Let's get the hang of the thing right. There's probably some hundreds of barges below Tower Bridge. It will be as well to keep a close eye on the docks and shipping offices. You see, he asserts his innocence."

      "H'm," commented Green, with an intonation that meant much. "He says, too, that there are reasons why he shouldn't be questioned."

      "Well, we shall see. There had better be an all-station message about the docks. Send two or three men down to Tilbury to watch outgoing boats there. We shan't need any other men from here. Wrington's staff know the river, and will get on best with them. I don't want to leave here until Blake lets us know more about the woman who left the advertisement. That gives us another possible clue."

      It was some time before Wrington, the divisional detective-inspector at the head of the detective staff of the Thames Division, could be found, for like other branches of the C.I.D. he and his men did their work systematically, and usually left their office at nine o'clock only to return at six. At length, however, he was found at a wharfinger's office, where there had arisen some question of a missing case of condensed milk. Within half an hour he was at Scotland Yard.

      A tall man with tired grey eyes, about the corners of which were tiny wrinkles, with a weather-beaten face and grey moustache, he aimed to look something like a riverside tradesman. There was a meekness in his manner and speech that deceived people who did not know his reputation. He spoke five languages fluently, and two more indifferently. Along the banks of the thirty-five-mile stretch of river for which he was responsible he had waged incessant warfare on thieves and receivers for thirty years, till now practically all serious crime had disappeared.

      He it was who, a dozen years before, had fought hand to hand with a naked and greased river thief armed with a knife, in a swaying boat under Blackfriars Bridge; he, too, solved the mystery of a man found dead in the Thames who had been identified by a woman as her husband—a dare-devil adventurer and unscrupulous blackmailer, who was declared by a doctor and a coroner's jury to have been murdered. Step by step he had traced it all out, from the moment when a seaman on a vessel moored at one of the wharves had taken a fancy to bathe, and being unable to swim had fastened a line round his waist and jumped overboard. He had neglected to make the end on board properly fast and was swept away by the current. The rope had twirled round him, and as the body swelled became fixed. A blow on the head from the propeller of a tug completed a maze of circumstantial evidence which might have served as an excuse to most men for giving up the problem. Yet Wrington had solved it, and the record, which had never seen the light of publicity, was hidden in the archives of the service.

      This was the man Foyle had now called in. He stood, with stooping shoulders, nervously twisting his shabby hat, apparently ill at ease. His nervousness dropped from him like a garment, however, when he spoke. Foyle made clear to him the purport of the excursion they were to embark on.

      "Very good, sir," he said. "If you think the man you want is on the river, we will find him. I guess, as you say, he's got a job as a watchman. He's probably had to get somebody to buy a barge, for they don't give these jobs without some kind of reference."

      "A reference could easily have been forged. But that doesn't matter. How soon can you get your men together?"

      "An hour,—perhaps two. They're scattered all over the place. I sent out to fetch 'em before I left Wapping."

      "Three or four will be enough. With Green and yourself and myself we should be able to tackle anything. Have a launch and a motor-boat at Westminster Bridge Pier in a couple of hours' time. If you can borrow them off some one, so that they don't look like police craft, so much the better."

      "I can do it, sir."

      "Good. In two hours' time, then."

      And Heldon Foyle turned away, dismissing the subject from his mind. Green had gone upstairs to find how Grant of the Finger-print Department had progressed in his scrutiny of the finger-prints on the advertisement. He found his specialist colleague with a big enlargement of the paper on which the advertisement had been written mounted on paste-board, and propped up in front of him, side by side with an enlargement of the prints found on the dagger.

      "Any luck?" asked Green.

      Grant shifted his magnifying glass to another angle and grunted.

      "Can't tell yet," he said irritably. "I've only just started. Go away."

      "Sorry I spoke, old chap," said the other. "Don't shoot; I'm going."

      Grant rested his chin on one elbow and stared sourly at the intruder.

      "Great heavens!" he said. "Isn't it enough to have two of my men ill when there are four hundred prints to classify, to have three newspaper reporters and a party of American sociological researchers down on me in one day, without——"

      But Green had fled to the more tranquil quarters on the first floor.

      "Mr. Foyle asking for you, sir," said the clerk.

      He pulled open the door of the superintendent's room. Foyle had got his hat and coat on.

      "Blake's wired that the woman has taken a ticket for Liverpool," he said. "He's gone on the same train. Now that's settled, let's see if we can't hurry Wrington up."

Chapter XXXII

       Table of Contents

      In the corner of the first-class carriage farthest away from the platform, the Princess Petrovska sat with her hands on her lap and a rug round her knees, glancing idly from under her long eyelashes at the people thronging the Euston departure platform. Her eyes rested incuriously now and again upon a couple of men who stood in conversation by a pile of luggage some distance away, but within eyeshot of the compartment.

      She had some vague recollection of having seen one of the men before, and though she remained apparently languidly interested in the business of the platform, she was racking her brains to think who he was or where she had seen him. It was recently, she was certain. Suddenly she leaned forward, and her smooth brow contracted in a frown. Yes—she was nearly certain. He had an overcoat and a silk hat on now, but when she last saw him he had been a bare-headed, frock-coated clerk in the advertisement office of the Daily Wire. The frown disappeared and she dropped back. But behind the placid face an alert brain was working. Had the man followed her, or was it a mere coincidence? Was he a detective? With an effort of will she stilled the apprehension in her breast. Her confidence reasserted itself. Even if he were a detective, what had she to fear? She had merely delivered a cipher advertisement over the counter. It was unlikely that it would be read by others than the person for whom it was intended. Even if it were, there was nothing in it to incriminate her.

      Her lips parted in a contemptuous smile.

      "I don't believe he is a detective at all," she murmured.

      All doubts on the subject, however, were set at rest as the express began to glide out of the station. As though taken unawares by its departure, the man hastily shook hands with his friend and sprinted for the train, swinging himself into the woman's compartment with a gasp of relief.