A careful examination of the line between Willesden and Rugby resulted in one discovery which might or might not have a bearing upon the tragedy.  Near Tring, at the very place where the train slowed down, there was found at the bottom of the embankment a small pocket Testament, very shabby and worn.  It was printed by the Bible Society of London, and bore an inscription:  “From John to Alice.  Jan. 13th, 1856,” upon the fly-leaf.  Underneath was written:  “James.  July 4th, 1859,” and beneath that again:  “Edward.  Nov. 1st, 1869,” all the entries being in the same handwriting.  This was the only clue, if it could be called a clue, which the police obtained, and the coroner’s verdict of “Murder by a person or persons unknown” was the unsatisfactory ending of a singular case.  Advertisement, rewards, and inquiries proved equally fruitless, and nothing could be found which was solid enough to form the basis for a profitable investigation.

It would be a mistake, however, to suppose that no theories were formed to account for the facts.  On the contrary, the Press, both in England and in America, teemed with suggestions and suppositions, most of which were obviously absurd.  The fact that the watches were of American make, and some peculiarities in connection with the gold stopping of his front tooth, appeared to indicate that the deceased was a citizen of the United States, though his linen, clothes and boots were undoubtedly of British manufacture.  It was surmised, by some, that he was concealed under the seat, and that, being discovered, he was for some reason, possibly because he had overheard their guilty secrets, put to death by his fellow-passengers.  When coupled with generalities as to the ferocity and cunning of anarchical and other secret societies, this theory sounded as plausible as any.

The fact that he should be without a ticket would be consistent with the idea of concealment, and it was well known that women played a prominent part in the Nihilistic propaganda.  On the other hand, it was clear, from the guard’s statement, that the man must have been hidden there before the others arrived, and how unlikely the coincidence that conspirators should stray exactly into the very compartment in which a spy was already concealed!  Besides, this explanation ignored the man in the smoking carriage, and gave no reason at all for his simultaneous disappearance.  The police had little difficulty in showing that such a theory would not cover the facts, but they were unprepared in the absence of evidence to advance any alternative explanation.

There was a letter in the Daily Gazette, over the signature of a well-known criminal investigator, which gave rise to considerable discussion at the time.  He had formed a hypothesis which had at least ingenuity to recommend it, and I cannot do better than append it in his own words.