"
"You're going to a lot of trouble for nothing, if your object is to try
and prove that he couldn't have seen into the window," grunted Inspector
Chippenfield, in a mystified voice. "Why, I can see plainly into the
window from here."
Crewe smiled, but did not reply. Followed by Rolfe, he went back to the
tree by the library window, where he posted Rolfe with the end of the
tape in his hand. Then he walked slowly back across the garden in the
direction of the garage, keeping his eye on the library window on the
first floor from which Kemp, according to his evidence, had seen Sir
Horace leaning out after Holymead had left the house. He returned to the
tree, noting the measurement in his book as he did so, and then repeated
the process, walking backwards with his eye fixed on the window, but this
time taking a line more to the left. Again and again he repeated the
process, until finally he had walked backwards from the tree in narrow
segments of a big semicircle, finishing up on the boundary of the Italian
garden on the other side of the grounds, and almost directly opposite to
the garage from which he had started.
"There's no use going further back than that," he said, turning to
Inspector Chippenfield, who had followed him round, smoking one of
Crewe's cigars, and very much mystified by the whole proceedings, though
he would not have admitted it on any account.
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