tried to shake the evidence of the guard, Catesby. He refused to make any admissions that would permit the police even to build up a theory. He was absolutely certain that Mr. Skidmore had been alone in the carriage at the moment that the express left London; he was absolutely certain that he had locked the door of the compartment, and the engine driver could testify that the train had never traveled at a less speed than sixty miles an hour until the bridge over the river leading into Lydmouth station was reached; even then nobody could have dropped off the train without the risk of certain death. Inspector Merrick was bound to admit this himself when he went over the spot. And the problem of the missing bullion boxes was quite as puzzling in its way as the mysterious way in which Mr. Skidmore had met his death.
There was no clue to this either. Certainly there had been a struggle, or there would not have been blood marks all over the place, and the window would have remained intact. Skidmore had probably been forced back into his seat, or he had collapsed there after the fatal shot was fired. The unfortunate man had been shot through the brain with an ordinary revolver of common pattern, so that for the purpose of proof the bullet was useless. There were no finger marks on the carriage door, a proof that the murderer had either worn gloves or that he had carefully removed all traces with a cloth of some kind. It was obvious, too, that a criminal of this class would take no risks, especially as there was no chance of his being hurried, seeing that he had had three clear hours for his work. The more the police went into the matter, the more puzzled they were. It was not a difficult matter to establish the bona fides of the passengers who traveled in the next coach with Skidmore, and as to the rest it did not matter. Nobody could possibly have left any of the corridor coaches without attracting notice; indeed, the very suggestion was absurd. And there the matter rested for three days.
It must not be supposed that the authorities had been altogether idle. Inspector Merrick spent most of his time traveling up and down the line by slow local trains on the off-chance of hearing some significant incident that might lead to a clue. There was one thing obvious—the bullion boxes must have been thrown off the train at some spot arranged between the active thief and his confederates. For this was too big a thing to be entirely the work of one man. Some of the gang must have been waiting along the line in readiness to receive the boxes and carry them to a place of safety. By this time, no doubt, 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
