I noticed, however, that this was the case with the man I suspected.

The heel of his left boot was very much worn down and on the inside.

The right, however, was intact.
On leaving the Continental Hotel, I made my way to the Police Commissioner's office, obtained an interview with him, and placed the evidence I had gleaned before him.

He was good enough to express his approval of my endeavours, but was doubtful whether the case against the Italian was strong enough yet to enable us to definitely bring the crime home to the man.
"At any rate it will justify our issuing a warrant for his arrest," he said, "and that had better be done with as little delay as possible.
Otherwise he will be out of the country." A warrant was immediately procured and an officer was detailed to accompany me in case I should need his assistance.

When we reached the Continental Hotel I inquired for Senor Gairdi, only to be informed that he had left the hotel soon after lunch.
"It is only what I expected," I said to my companion.