the boxes themselves had been destroyed; but eight thousand pounds in gold takes some moving, and probably a conveyance, a motor for choice, had been employed for this purpose. But nobody appeared to have seen or heard anything suspicious on the night of the murder; no prowling gamekeeper or watcher had noticed anything out of the common. Along the Essex and Norfolk marshes, where the Grand Coast Railway wound along like a steel snake, they had taken their desolate and dreary way. True, the dead body of a man had been found in the fowling nets up in the mouth of the Little Ouse, and nobody seemed to know who he was; but there could be no connection between this unhappy individual and the express criminal. Merrick shook his head as he listened to this from a laborer in a roadside public house where he was making a frugal lunch on bread and cheese.
"What do you call fowling nets?" Merrick asked.
"Why, what they catches the birds in," the rustic explained. "Thousands and thousands of duck and teel and widgeon they catches at this time of year. There's miles of nets along the road—great big nets like fowl runs. Ye didn't happen to see any on 'em as ye came along in the train?"
"Now I come to think of it, yes," Merrick said thoughtfully. "I was rather struck by all that netting. So they catch sea birds that way?"
"Catches 'em by the thousand, they does. Birds fly against the netting in the dark and get entangled. Ducks they get by 'ticing 'em into a sort of cage with decoys. There's some of 'em stan's the best part of half a mile long. Covered in over the top like great cages. Ain't bad sport, either."
Merrick nodded. He recollected it all clearly now. He recalled the wide, desolate mud flats running right up to the railway embankment for some miles. At high tide the mud flats were under water, and out of these the great mass of network rose both horizontally and perpendicular. And in this tangle the dead body of a man had been found after the storm.
There was nothing really significant in the fact that the body had been discovered soon after the murder of Mr. George Skidmore. Still, there might be a connection between the two incidents. Merrick was going to make inquiries; he was after what looked like a million to one chance. But then Merrick was a detective with an imagination, which was one of the reasons why he had been appointed to the job. It was essentially a case for the theoretical man. It baffled all the established rules of the game.
Late the same afternoon Merrick arrived at Little Warlingham by means of a baker's cart. It was here that the body of the drowned man lay awaiting the slim chances of identity. If nothing transpired during the next eight and forty hours, the corpse would be buried by the parish authorities. The village policeman acted as Merrick's guide. It was an event in his life that he was not likely to forget.
"A stranger to these parts, I should say, sir," the local officer said. "He's in a shed at the back of the 'Blue Anchor,' where the inquest was held. If you come this way, I'll show him to you."
"Anything found on the body?"
"Absolutely nothing, sir. No mark on the clothing or linen, either. Probably washed off some ship in the storm. Pockets were quite empty, too. And no signs of foul play. There you are, sir!"
Casually enough Merrick bent over the still, white form lying there. The dead face was turned up to the light, Rembrandtesque, coming through the door. The detective straightened himself suddenly, and wiped his forehead.
"Stranger to you, sir, of course?" the local man said grimly.
"Well, no," Merrick retorted. "I happen to know the fellow quite well. I'm glad I came here."
Until it was quite too dark to see any longer Merrick was out on the mud flats asking questions. He appeared to be greatly interested in the wildfowlers and the many methods of catching their prey. He learned, incidentally, that on the night of the express murder most of the nets and lures had been washed away. He took minute particulars as to the state of the tide on the night in question; he wanted to know if the nets were capable of holding up against any great force. For instance, if a school of porpoises came along? Or if a fish eagle or an osprey found itself entangled in the meshes?
The fowlers smiled. They invited Merrick to try it for himself. On that stormy east coast it was foolish to take any risks. And Merrick was satisfied. As a matter of fact, he was more than satisfied.
He was really beginning to see his way at last. By the time he got back to his headquarters again he had practically reconstructed the crime. As he stood on the railway permanent way, gazing down into the network of the fowlers below, he smiled to himself. He could have tossed a biscuit on to the top of the long lengths of tarred and knotted rigging. Later on he telephoned to the London terminus of the Grand Coast Railway for the people there to place the services of Catesby at his disposal for a day or two. Could Catesby meet him at Lydmouth to-morrow?
The guard could and did. He frankly admitted that he was grateful for the little holiday. He looked as if he wanted it. The corners of his mouth twitched, his hands were shaky.
"It's nerves, Mr. Merrick," he explained. "We all suffer from them at times. Only we don't like the company to know it, ye understand? To tell the truth, I've never got over that affair at the Junction here eight years ago. I expect you remember that."
Merrick nodded. Catesby was alluding to a great railway tragedy which had taken place outside Lydmouth station some few years back. It had been a most disastrous affair for a local express, and Catesby had been acting as guard to the train. He spoke of it under his breath.
"I dream of it occasionally even now," he said. "The engine left the line and dragged the train over the embankment into the river. If you ask me how I managed to escape, I can't tell you. I never come into Lydmouth with the night express now without my head out of the window of the van right away from the viaduct till she pulls up at the station. And what's more, I never shall. It isn't fear, mind you, because I've as much pluck as any man. It's just nerves."
"We get 'em in our profession, too," Merrick smiled. "Did you happen to be looking out of the window on the night of the murder?"
"Yes, and every other night, too. Haven't I just told you so? Directly we strike the viaduct I come to my feet by instinct."
"Always look out the same side, I suppose?"
"Yes, on the left. That's the platform side, you understand."
"Then if anybody had left the train there——"
"Anybody left the train! Why we were traveling at fifty miles an hour when we reached the viaduct. Oh, yes, if anybody had left the train I should have been bound to see them, of course."
"But you can't see out of both windows at once."
"Nobody could leave the train by the other side. The stone parapet of the viaduct almost touches the footboard, and there's a drop of ninety feet below that. Of course I see what you are driving at, Mr. Merrick. Now look here. I locked Mr. Skidmore in the carriage myself, and I can prove that nobody got in before we left London. That would have been too dangerous a game so long as the train was passing any number of brilliantly lighted stations, and by the time we got into the open we were going at sixty miles an hour. That speed never slackened till we were just outside Lydmouth, and I was watching at the moment that our pace dropped. I had my head out of the window of my van till we pulled up by the platform. I am prepared to swear to all this if you like. Lord knows how the thing was done, and I don't suppose anybody else ever will."
"You are mistaken there," said Merrick drily. "Now, what puzzles you, of course, is the manner in which the murderer left the train."
"Well, isn't that the whole mystery?"
"Not to me. That's the part I really do know. Not that I can take any great credit to myself, because luck helped me. It was, perhaps, the most amazing piece of luck I have ever had. It was my duty, of course, to take no chances, and I didn't. But we'll come to that presently. Let it suffice for the moment that I know how the murderer left the train. What puzzles me is to know how he got on it. We can dismiss every other passenger in the train, and we need not look for an accomplice. There were accomplices, of course, but they were not on the express. Why didn't