Now was the moment! Roper could not be far away.

But Tanner continued to look searchingly about him. The additional bustle of the arrival waxed and waned and the platform began to clear, people drifting away towards the exit or clustering round carriage doors close to the train. And still no sign of Roper.

The express was timed to wait for eighteen minutes, and of these at least fifteen had slipped away. Porters were already slamming doors, and the guard was coming forward, lamp in hand, ready to give the right away signal. Tanner stepped forward clear of the train and once again gazed up and down the platform, then as the hands of the clock reached the starting time he turned back and retrieved his suitcase from the compartment. The guard whistled and waved his green lamp, the coaches began to glide slowly away, the dull rumble swelled up and died away, and in a second or two some rapidly dwindling red lights were all that were left of the train.

French was almost speechless from chagrin. Had his plan failed? Was it possible that Roper had been one too many for him? Had the man suspected a plant and kept away from the station? Or was he even now in some hidden nook on the platform doubtful of Tanner’s identity and waiting to see what would materialise?

As the minutes slipped away French, unspeakably disappointed, found himself forced to the conclusion that the affair had miscarried. Roper must have become alive to his danger. Perhaps he had suspected French’s wire and had replied as he did merely in order to gain time to disappear. Perhaps by this time the clue of the tobacconist’s shop itself was a washout. French swore bitterly.

But they could not remain in the office for ever, nor could Tanner be left to pace the platform indefinitely. With a word of explanation to Philpot, French passed out, and the two men strolled in the direction of Tanner. French greeted him quietly and introduced Philpot, and the three stood talking.

“Washout?” Tanner said laconically, glancing at his colleague.

“Looks like it,” French admitted, and turning to Philpot, began to apologise for having brought him from Glasgow on a wild goose chase. “I’m sorry that I can’t stay and offer you hospitality either,” he went on. “I must get round to police headquarters and start some further inquiries. But let us go and have a parting drink to our mutual good luck in the future.”

They passed into the refreshment room, French pre-occupied and, for him, somewhat brusque, Tanner frankly bored, and Philpot showing evidences of mixed feelings of disappointment and relief.

“I wish you people weren’t so infernally close about your business,” the doctor complained as they stood at the bar waiting for the three small Scotches and sodas French had ordered. “Here am I, vastly interested in the affair and anxious to know what your further chances are, and you’re as close as a pair of limpets. Surely I know so much that a little more won’t hurt. Do you think you’ll get him soon?”