You may have noticed a
sort of blur extending all across the picture. I will not
describe to you the special apparatus, dusting powder, etc.,
which I used. It is a well-known process to the police, and by
means of it you can obtain a photograph of the finger-prints of
any object in a very short space of time. Well, my friend, you
have seen the finger-marks--it remains to tell you the particular
object on which they had been left."
"Go on--I am really excited."
"Eh bien! Photo No. 3 represents the highly magnified surface of
a tiny bottle in the top poison cupboard of the dispensary in the
Red Cross Hospital at Tadminster--which sounds like the house
that Jack built!"
"Good heavens!" I exclaimed. "But what were Lawrence Cavendish's
finger-marks doing on it? He never went near the poison cupboard
the day we were there!"
"Oh, yes, he did!"
"Impossible! We were all together the whole time."
Poirot shook his head.
"No, my friend, there was a moment when you were not all
together. There was a moment when you could not have been all
together, or it would not have been necessary to call to Monsieur
Lawrence to come and join you on the balcony.
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