'Possibly. Tell me about the case.'

'I thought everybody knew the particulars. Mr. Barrie Kipson lived at Pegram. He carried a first-class season ticket between the terminus and that station. It was his custom to leave for Pegram on the 5.30 train each evening. Some weeks ago, Mr. Kipson was brought down by the influenza. On his first visit to the City after his recovery, he drew something like £300 in notes, and left the office at his usual hour to catch the 5.30. He was never seen again alive, as far as the public have been able to learn. He was found at Brewster in a first-class compartment on the Scotch Express, which does not stop between London and Brewster. There was a bullet in his head, and his money was gone, pointing plainly to murder and robbery.'

'And where is the mystery, might I ask?'

'There are several unexplainable things about the case. First, how came he on the Scotch Express, which leaves at six, and does not stop at Pegram? Second, the ticket examiners at the terminus would have turned him out if he showed his season ticket; and all the tickets sold for the Scotch Express on the 21st are accounted for. Third, how could the murderer have escaped? Fourth, the passengers in the two compartments on each side of the one where the body was found heard no scuffle and no shot fired.'

'Are you sure the Scotch Express on the 21st did not stop between London and Brewster?'

'Now that you mention the fact, it did. It was stopped by signal just outside of Pegram. There was a few moments' pause, when the line was reported clear, and it went on again. This frequently happens, as there is a branch line beyond Pegram.'

Mr. Sherlaw Kombs pondered for a few moments, smoking his pipe silently.

'I presume you wish the solution in time for tomorrow's paper?'

'Bless my soul, no. The editor thought if you evolved a theory in a month you would do well.'

'My dear sir, I do not deal with theories, but with facts. If you can make it convenient to call here tomorrow at 8 a.m. I will give you the full particulars early enough for the first edition. There is no sense in taking up much time over so simple an affair as the Pegram case. Good afternoon, sir.'