His first care was to compare the list of outward lorries which he and Willis had made with the blocks for the same period. A short investigation convinced him that here also everything was in order. There was a certificate for every lorry which had passed out, and not only so, but the number of the lorry, the day and hour at which it left and the load were all correct so far as his observations had enabled him to check them. It was clear that here also he had drawn blank, and for the fiftieth time he wondered with a sort of rueful admiration how the fraud was being worked.
He was idly turning over the leaves of the blocks, gazing vacantly at the lines of writing while he pondered his problem when his attention was attracted to a slight difference of color in the ink of an entry on one of the blocks. The consignment was a mixed one, containing different kinds of spirituous liquors. The lowest entry was for three twenty-five gallon kegs of French brandy. This entry was slightly paler than the remain order.
At first Hunt did not give the matter serious thought. The page had evidently been blotted while the ink was wet, and the lower items should therefore naturally be the fainter. But as he looked more closely he saw that this explanation would not quite meet the case. It was true that the lower two or three items above that of the brandy grew gradually paler in proportion to their position down the sheet, and to this rule Archer’s signature at the bottom was no exception. In these Hunt could trace the gradual fading of color due to the use of blotting paper. But he now saw that this did not apply to the brandy entry. It was the palest of all—paler even than Archer’s name, which was below it.
He sat staring at the sheet, whistling softly through his teeth and with his brow puckered into a frown, as he wondered whether the obvious suggestion that the brandy item had been added after the sheet had been completed, was a sound deduction. He could think of no other explanation, but he was loath to form a definite opinion on such slight evidence.
He turned back through the blocks to see if they contained other similar instances, and as he did so his interest grew. Quite a number of the pages referring to mixed consignment had for their last item kegs of French brandy. He scrutinized these entries with the utmost care. A few seemed normal enough, but others showed indications which strengthened his suspicions. In three more the ink was undoubtedly paler than the remainder of the sheet, in five it was darker, while in several others the handwriting appeared slightly different—more upright, more sloping, more heavily or more lightly leaned on. When Hunt had examined all the instances he could find stretching over a period of three months, he was convinced that his deduction was correct. The brandy items had been written at a different time from the remainder, and this could only mean that they had been added after the certificate was complete.
His interest at last keenly aroused, he began to make an analysis of the blocks in question in the hope of finding some other peculiarity common to them which might indicate the direction in which the solution might lie.
And first as to the consignees. Ackroyd & Holt evidently supplied a very large number of licensed houses, but of these the names of only five appeared on the doubtful blocks. But these five were confined to houses in Hull, and each was a large and important concern.
“So far, so good,” thought Hunt, with satisfaction. “If they’re not planting their stuff in those five houses, I’m a Dutchman!”
He turned back to the blocks and once again went through them. This time he made an even more suggestive discovery. Only one lorry-man was concerned in the transport of the doubtful consignments. All the lorries in question had been in charge of a driver called Charles Fox.
Hunt remembered the man. He had driven three of the eight lorries Hunt himself had examined, and he had been most civil when stopped, giving the investigator all possible assistance in making his inspection. Nor had he at any time betrayed embarrassment. And now it seemed not improbable that this same man was one of those concerned in the fraud.