Burckhardt glanced at Dietrich with an expressionless face, but the Abwehr man was still studying Hahnemann, who glared back at him defiantly. 'And no torch?' Dietrich queried in a deceptively mild tone. 'Not even a pocket torch?'
Hahnemann looked confused. He started to answer Dietrich, then his face stiffened and he addressed Burckhardt. 'One of them had a torch, yes, sir. It was inside the pocket of his coat hanging up behind the door.'
Dietrich caught Burckhardt's glance and he lifted his eyebrows in an expression of foreboding, then frowned at Schnell who had turned to say something. 'Here it comes, sir. They've started.' Across the swelling Aegean where the waves were growing higher a light began to wink on and off from the destroyer. Schnell bad half-turned to starboard, his eyes fixed on the flashing lamp which went on with Its brief explosions. On the bridge no one moved or spoke as all eyes were fixed hypnotically on the signalling light and Burckhardt could feel the stillness of men suspended in a state of horrible anticipation. So much depended on the next few minutes but Burckhardt had no intention of surrendering, whatever happened. He had had some experience of the devastating fire a British destroyer could lay down; in Norway he had seen a German troop transport reduced to a burning hulk by only a few salvoes. What those four-inch guns might do to the hull of the Hydra was something he preferred not to contemplate. The lamp stopped flashing and Schnell spoke.
'We are asked to identify ourselves.'
Burckhardt stood up a little straighter and gave Nopagos his instructions in Greek. 'Signal that we are the Greek ship Hydra. Nothing more. And remember that Lieutenant Schnell is a naval officer.'
The tension on the bridge was becoming almost unbearable, like a physical affliction. Nopagos wiped his lips and glanced behind to where the Alpenkorps man gazed straight at him, the muzzle of the machine-pistol aimed at the small of his back. Burckhardt nodded confidently without speaking, as much as to say get on with it. The captain adjusted his cap and started to flash the lamp while Schnell watched him coldly, his hands still on the wheel. To the colonel it seemed to take an age to send the short message. Was marine signalling really so complicated? Was Nopagos managing to trick Schnell while he inserted a desperate SOS among the jumble of flashes? A dozen appalling possibilities ran through his mind but he could do nothing but wait, hoping that his threat had struck home to the Greek. The lamp stopped flashing. Nopagos mopped the back of his neck with a coloured handkerchief as Schnell addressed Burckhardt over his shoulder.
'He has identified us simply as the Hydra, ownership Greek. Nothing more.'
With a supreme effort Burckhardt resisted the impulse to let his shoulders relax; both the Alpenkorps soldiers kept glancing towards him for reassurance. German soldiers, Burckhardt had noticed before, were never entirely happy at sea – the existence of the British Navy probably had something to do with their lack of enthusiasm for water-borne expeditions. He watched the destroyer still moving on her oblique course. Would her captain be satisfied with that signal? Just a routine check, Dietrich had suggested. But a moment later he had raised the unnerving suggestion that the two British soldiers might have been put on board deliberately – that the destroyer out there was expecting another flashing signal from a porthole confirming that all was well aboard the Hydra. Blast the Abwehr!
'They're signalling again!' Schnell spoke quietly, his eyes on the distant flashing light which was now less than a quarter of a mile away. Burckhardt stood quite still, resisting the impulse to pace up and down the bridge: it was vital at this moment to preserve an absolute outward calm. He felt that his feet had been glued to the deck for hours and God knew there were enough signs of tension on the bridge already. The signal lamp in Nopagos' hands wobbled slightly – if he had to carry on answering these bloody questions much longer he was going to crack. The soldier crouched behind the Greek captain was sweating profusely, his forehead gleaming from the light over the bridge. Hahnemann was lightly tapping a nervous fingernail on the butt of his machine-pistol and Burckhardt wanted to roar at him for God's sake stop it! Schnell, a highly experienced naval officer, was still holding the wheel tightly. All these little details Burckhardt took in automatically while the lamp on the British destroyer blandly went on flashing its message. Only Dietrich seemed undisturbed, almost at ease as he stared at the ceiling with the unlit cigar motionless in the centre of his mouth. He dropped his eyes and caught the colonel watching him.
"There is a Greek called Grapos aboard,' Dietrich commented. 'I think he could be dangerous if he isn't watched carefully.'
'I dealt with him myself,' said Hahnemann in a flat tone. 'He was sleeping in the saloon – he had no cabin – and I was able to knock him out before he knew I was there. He's tied up in one of the holds.' The endless strain of waiting had neutralized his natural dislike of the Abwehr man and he looked at Dietrich without resentment.
'I do have this ship under control,' Burckhardt added icily.
'Perhaps it might be better if I went below,' Dietrich said almost amiably. He glanced to his left and saw that Hahnemann was leaving the bridge as a cloud of spray broke over the bows of the Hydra. When the lieutenant had gone there was a loaded silence as the light from the destroyer continued flashing, the ferry's engines went on throbbing heavily, and the sea heaved endlessly under them. After the winking light had stopped, Schnell cleared his throat twice before speaking. 'They wish us to report where we're from, our ultimate destination and the time of arrival.'
Without hesitation Burckhardt rapped out more instructions in Greek. 'Tell them we're bound from Istanbul, that our destination is Katyra, Zervos, and our estimated time of arrival 05-30 hours.' Nopagos blinked, glanced again at the sweating soldier behind him, took a firmer grip on the lamp and began signalling. The gun muzzles of the destroyer could be clearly seen in the moonlight as the vessel remorselessly continued on course without altering direction by as much as a single degree. Burckhardt found it unnerving – why was all this interest being shown in an ancient Greek ferry which spent its life plying between Istanbul and the remote peninsula of Zervos? He kept a tight grip on himself as Dietrich's rumbling voice spoke again behind his back. 'I'm wondering now whether this signalling isn't a smoke-screen put out until they get close to us. If they were expecting their own private signal from the prisoners below the course they are maintaining would make sense – they would keep on that course until they fired the first shot across our bows. Ten minutes should tell us the worst.' And having fired this last shot across the colonel's bows he quietly left the bridge and went out on deck.
Tight-lipped, Burckhardt heard him go, relieved that at long last the Abwehr man was leaving the bridge. But secretly Burckhardt agreed that Dietrich's estimate was just about right. In the next ten minutes they should know the worst.
CHAPTER FIVE
Sunday, April 6
As he struggled in the darkness with the ropes which bound his wrists. Prentice was bathed in sweat from his exertions. He lay in his bunk sprawled on his side, his ankles also tightly bound together while a further length of rope joined his wrists to his ankles, a rope drawn up so tautly that his knees were permanently bent. The fact that they had thought of turning out the cabin lights didn't help him either; it meant he had to work blindly by feel and this made ten times more difficult a task which already seemed insuperable. And because his hands were tied behind his back he had soon given up the attempt to fiddle with the knots he couldn't see, and a little later, when it struck him that they had probably used Alpenkorps climbing rope, he gave up his efforts to break the cords by stretching his wrists against them – a rope which could support a man dangling from a cliff face was hardly likely to weaken under the mere pressure of two straining wrists. So it seemed hope-lejs: a rope which couldn't be broken and which couldn't be untied. There was, however, one other alternative. Prentice was thin-boned and he had unusually slim wrists, so now he was concentrating all his strength on compressing his hands into the smallest possible area and then trying to pull them upwards through the loops which imprisoned him. His success to date had fallen rather short of the milder achievements of Houdini and for a few minutes he stopped struggling while he rested.