That was the last his servants had seen of him.

With regard to the revolver, all four servants swore positively that they had never seen it before, and that, unless Mr.Cohen had bought it that very day, it did not belong to their master.
"Beyond that, no trace whatever of the murderer had been found, but on the morning after the crime a couple of keys linked together by a short metal chain were found close to a gate at the opposite end of the Square, that which immediately faced Portland Place.

These were proved to be, firstly, Mr.Cohen's latch-key, and, secondly, his gate-key of the Square.
"It was therefore presumed that the murderer, having accomplished his fell design and ransacked his victim's pockets, had found the keys and made good his escape by slipping into the Square, cutting under the tunnel, and out again by the further gate.

He then took the precaution not to carry the keys with him any further, but threw them away and disappeared in the fog.
"The jury returned a verdict of wilful murder against some person or persons unknown, and the police were put on their mettle to discover the unknown and daring murderer.

The result of their investigations, conducted with marvellous skill by Mr.William Fisher, led, about a week after the crime, to the sensational arrest of one of London's smartest young bucks.
"The case Mr.Fisher had got up against the accused briefly amounted to this: "On the night of February 6th, soon after midnight, play began to run very high at the Harewood Club, in Hanover Square.