"
"Could it not have been dropped from a bridge?"
"I should say it was impossible. If you examine the roofs you
will find that they are slightly rounded, and there is no railing
round them. Therefore, we can say for certain that young Cadogan
West was placed on it."
"How could he be placed there?"
"That was the question which we had to answer. There is only one
possible way. You are aware that the Underground runs clear of
tunnels at some points in the West End. I had a vague memory
that as I have travelled by it I have occasionally seen windows
just above my head. Now, suppose that a train halted under such
a window, would there be any difficulty in laying a body upon the
roof?"
"It seems most improbable."
"We must fall back upon the old axiom that when all other
contingencies fail, whatever remains, however improbable, must be
the truth. Here all other contingencies HAVE failed. When I
found that the leading international agent, who had just left
London, lived in a row of houses which abutted upon the
Underground, I was so pleased that you were a little astonished
at my sudden frivolity.
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