James had always been accustomed to carrying a considerable sum of money on him; Gaffney's search had brought a considerable sum to light.

James also wore a very valuable watch and chain and two fine diamond rings; there they all were.

Not robbery--no; at least, not robbery of the ordinary sort.
But--had there been robbery of another, a bigger, a subtle, and deep-designed sort?
James was a man of many affairs and schemes--he might have had valuable securities, papers relating to designs, papers containing secrets of great moment; he was interested, for example, in several patents--he might have had documents pertinent to some affair of such importance that ill-disposed folk, eager to seize them, might have murdered him in order to gain possession of them.

There were many possibilities, and there was always--to Allerdyke's mind--the improbability that James had died through sudden illness.
Now that Marshall Allerdyke's mind was clearing, getting free of the first effects of the sudden shock of finding his cousin dead, doubt and uneasiness as to the whole episode were rising strongly within him.

He and James had been brought up together; they had never been apart from each other for more than a few months at a time during thirty-five years, and he flattered himself that he knew James as well as any man of James's acquaintance.