confidence," he said. "Pray proceed."

"Thank you. I will not bore you with any preliminary details, for they are too recent to have faded from your memory. Sufficient that we have a murder committed in an express train; we have the disappearance of eight thousand pounds in gold, without any trace of the criminal. That he was on the train at the start is obvious. That he was not in any of the carriages conveying ordinary passengers is equally obvious. It is also certain that he left the train after the commission of the crime. Doubtless you read the evidence of the guard to prove that nobody left the train after the viaduct leading to Lydmouth station was reached. Therefore, the murderer contrived to make his escape when the express was traveling at sixty miles per hour."

"Is not all this superfluous?" the Marquis asked.

"Well, not quite. I am going to tell you how the murderer joined the train and how he left it after the murder and the robbery."

"You are going to tell me that! Is it possible?"

"I think so," Merrick said modestly. "Now, Mr. Skidmore had a compartment to himself. He was locked in the very last thing, and nobody joined the train afterward. Naturally a—well—an amateur detective like myself wanted to know who was in the adjoining compartments. Three of these could be dismissed at once. But in the fourth there was a corpse——"

"A corpse! But there was no mention of that at the inquest."

"No, but the fact remains. A corpse in a coffin. In a dark compartment with the blinds down. And, strangely enough, the firm of undertakers who consigned, or were supposed to consign, the body to Lydmouth denied the whole business. Therefore, it is only fair to suppose that the whole thing was a put-up job to get a compartment in the coach that Mr. Skidmore traveled by. I am going to assume that in that coffin the murderer lay concealed. But let me give you a light—your cigarette is out."

"I smoke no more," the Marquis said. "My throat, he is dry. And then——"

"Well, then, the first part is easy. The man gets out of the coffin and proceeds to fill it with some heavy substance which has been smuggled into the carriage under the pall. He screws the lid down and presently makes his way along the footboard to the next compartment. An athlete in good condition could do that; in fact, a sailor has done it in a drunken freak more than 

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