'All right, let's hear your theory,' Wells whispered.
'The sheds at Hook Quay are round the bend of the creek so no light shown there could be seen for more than five hundred yards down stream. That's probably why Gavin chose it as the actual landing place, but it has one drawback, they can't signal from it. Now this place is right on the bend of the river. A light in the upstairs room of the house, on its far side, could be seen for five miles at least, right down at the entrance of the Swale. That's how they signal to the incoming fleet of luggers that the coast is clear, or if there are any suspicious looking people about, and the smuggler boats had best hang off for a bit.'
'That's sound enough. I see they're on the telephone too,' Wells remarked, jerking his head towards a stout pole only a yard away from them. 'That in itself is suspicious; seeing it's only a jerry-built place miles from anywhere. It must have cost them quite a bit to get a line brought down from Eastthurch Station; far more than ordinary people who lived in a little place like this could afford.'
They were crouching behind a pile of debris, left by the builders, about thirty yards from the cottage. 'I wish we could get near enough to look in at that window/ Gregory said thoughtfully; but Wells shook his head.
'Too risky. If they spotted us they'd be on the telephone to warn their pals the game was up before we could get inside. Now we've seen all there is to see I think we'd best get back to the others.'
In one of the sheds Sir Pellinore, the Chief Constable, Marrowfat and the rest, were gathered, seated on the dry earth floor busily engaged in eating a picnic supper. Producing their own packets of sandwiches Gregory and Wells joined them.
When they had finished Sir Pellinore, who had refused offers of various drinks, produced a large medicine bottle from his pocket, removed the cork, and took a long pull at it.
'Not allowed to drink with my meals,' he lied cheerfully, winking at Gregory, 'gives me such awful indigestion. That's why I have to take this medicine.'
Gregory kept a perfectly straight face as he listened to this barefaced lie. He had often seen that interesting medicine bottle before. Whenever Sir Pellinore was compelled to accept an invitation for dinner at a house where he distrusted his host's choice of wines the medicine bottle always travelled with him. He left it outside in the hall and sent for it after dinner; having first pronounced his glib tarradiddle about suffering from indigestion. The medicine it contained was in actual fact an ample ration of his own impeccable Napoleon Brandy.
At eleven o'clock they switched off the shuttered electric lamps they had brought with them. The Chief Constable and his party remained seated in the darkness of the shack, except Marrowfat, who went out to check the final dispositions of the Special Squad men he had brought with him from the Yard. One of these sat in the doorway with a boxlike apparatus before him and a pair of telephone receivers clamped over his ears. It was a small portable wireless set.
Soon after Marrowfat had left them Gregory got up and strolled outside. He waited for a little on the edge of the wharf keeping a watchful eye upon the end of the track to landward. He was desperately impatient now for something to happen, so that he could submerge his gnawing anxiety for Sabine in the necessity for action, but he scarcely moved a muscle when a familiar figure sidled up to him out of the darkness.
'All present and correct sir,' came Rudd's husky mutter.
'Fine. Keep close by me from now on and be ready to bolt for the car the second I do.' Gregory turned and walked slowly back to the shed with Rudd beside him.
As reports came through that the various forces on the north Kent coast and in the island of Sheppey had taken up their positions, the man at the wireless spoke in a low voice to a stenographer who sat beside him, his pad held under a boxed in light. Before eleven most of the land contingents had already reached their stations and the river police now reported themselves ready at their rendezvous by the Ham Fishery Buoy.,
After that they spoke little. To Gregory the period of waiting seemed interminable. He tried to keep his mind clear and alert, but he could not free it from the thought of Sabine, and fruitless speculations as to where she was, and what might happen to her in the next few hours.
At length a message came through from the river police. Their sound detectors had picked up the motor engines of a numerous convoy moving in the direction of Clite Hole Bank northeast of Herne Bay. A little later another report gave the convoy as directly south of them, off Pollard Spit at the mouth of the East Swale, and the river police stated that they were now moving in.
At a quarter to twelve the little group who waited in the darkness of the shack estimated that the smugglers must be entering Windmill Creek itself; then a message came through from the river police that they had closed the mouth of the Swale and were running up it.
Five minutes later a report came by wireless from another police post, a mile away at the entrance of the creek, that a fleet of six motor barges were proceeding past them at that moment without lights. The Superintendent's party stirred into activity.
'They may land here,' Gregory said in a low voice to Wells, 'but the centre of the trouble's going to be at that cottage. Let's get down there.'
'We've got it covered by a dozen men,' Wells answered, 'but I think you're right and I'd like to be in at the finish.'
They put out their cigarettes and hurried along the bank. The light in the window of the cottage had disappeared, but they turned inland, skirting it at some distance and on reaching its farther side, saw that Gregory's surmise was proved correct. The upper window made an oblong of bright light; naked and uncurtained. The only thing that marred its symmetry was the outline of a black cat seated, apparently, upon the sill inside.
For a few moments Gregory watched the cat. It remained absolutely motionless and, as he was standing only about twenty yards from the window, he suddenly realised that it was not a cat at all; but a black silhouette in the form of a cat, either painted or stuck on the lower section of the window. It was a sign which would arouse no suspicion in a casual passer-by but, with good glasses, it could probably be seen miles away down the river as a black outline against the rectangle of light. Obviously it was the signal to the smuggler fleet that all was well.
As he crouched there peering at it the soft chug chug chug of motor engines came to him out of the darkness from the river. He crouched lower, pulling Wells down beside him, so that their forms should not be visible against the skyline. Rudd, just behind them, was already on his knees.
Six large motor barges chugged swiftly by and rounded the corner of the stream.
'Will Marrowfat pounce on them the moment they land?' Gregory whispered.
'No,' Wells whispered back. 'He'll give them a chance to unload some of their cargo and wait until the river police close in behind them.'
The noise of the motors grew less; then ceased. Silence settled 4gain over the low, apparently deserted, stretch of country. It was broken only at intervals by the faint sound of men's voices, drifting on the night air, as the first barge was moored against Hook Quay and the others came up alongside it.
Wells and Gregory waited with what patience they could muster. The Inspector knew that one of his men was squatting ten yards away to their right, another down on the river bank to their left, and that a dozen more were hidden in the marsh grass close at hand all round. Touching Gregory on the elbow he began to make his way stealthily towards the creek where he took up a fresh position from which he could see the front door of the cottage.