you may have observed, a bicycle shop next
to our inn. Into this I rushed, engaged a bicycle, and was able to get
started before the carriage was quite out of sight. I rapidly overtook
it, and then, keeping at a discreet distance of a hundred yards or so, I
followed its lights until we were clear of the town. We had got well out
on the country road when a somewhat mortifying incident occurred. The
carriage stopped, the doctor alighted, walked swiftly back to where I
had also halted, and told me in an excellent sardonic fashion that
he feared the road was narrow, and that he hoped his carriage did not
impede the passage of my bicycle. Nothing could have been more admirable
than his way of putting it. I at once rode past the carriage, and,
keeping to the main road, I went on for a few miles, and then halted in
a convenient place to see if the carriage passed. There was no sign of
it, however, and so it became evident that it had turned down one of
several side roads which I had observed. I rode back, but again saw
nothing of the carriage, and now, as you perceive, it has returned after
me. Of course, I had at the outset no particular reason to connect
these journeys with the disappearance of Godfrey Staunton, and was only
inclined to investigate them on the general grounds that everything
which concerns Dr. Armstrong is at present of interest to us; but, now
that I find he keeps so keen a look-out upon anyone who may follow him
on these excursions, the affair appears more important, and I shall not
be satisfied until I have made the matter clear."

"We can follow him to-morrow."

"Can we? It is not so easy as you seem to think. You are not familiar
with Cambridgeshire scenery, are you? It does not lend itself to
concealment. All this country that I passed over to-night is as flat and
clean as the palm of your hand, and the man we are following is no fool,
as he very clearly showed to-night. I have wired to Overton to let us
know any fresh London developments at this address, and in the meantime
we can only concentrate our attention upon Dr. Armstrong, whose name
the obliging young lady at the office allowed me to read upon the
counterfoil of Staunton's urgent message. He knows where the young man
is--to that I'll swear--and if he knows, then it must be our own fault
if we cannot manage to know also. At present it must be admitted that
the odd trick is in his possession, and, as you are aware, Watson, it is
not my habit t