The men by the main entrance began to fire at him. He slipped back through the archway and gestured to Pauncho and Barney to follow him. Waiting for a pause in the firing, he leaped across so swiftly he must have seemed a blur to the invaders. They fired again but too late. And the other two, bending over, ran past the space where they would be exposed to the firing when there was another pause.

Someone shouted then. Many boots slapped on the marble floor. Pauncho spun and pulled a pin and bounced a grenade off the side of the archway and into the next room. Before the first had exploded, he had sent a second after it. All three were racing toward the exit at the far end of the room when the blasts came, one, two.

And then three, four.

The last two went off near or under an enormous table of mahogany and marble, twenty yards behind them. It broke in two and soared out of the smoke. The concussion pushed them on through the doorway out of the room and knocked them down.

They scrambled to their feet. Pauncho roared, 'Our grenades and theirs passed each other!'

Doc gestured at Barney, who slipped out his two grenades and threw them, one after the other, at the far archway. One hit the edge and bounced back into the room. The other caromed off at the proper angle. The three stepped around the corner to be out of the direct influence of the explosion.

Two roars succeeded their two as someone tossed in grenades from the other side.

Doc signalled that they should keep on going. They passed through several large rooms and then Doc stopped. He had detected a slight crinkling of a large tapestry hanging on the wall to the right. Lifting the tapestry up, he looked behind it. The wall was of solid stone blocks bound in mortar. Or they seemed to be. But he had seen the stone-block wall in the bedroom up-stairs slide away, and the tapestry might have been caught slightly, or bent, when a section behind it closed.

He quickly examined the area behind the tapestry and pressed here and there but nothing happened. Either the opening device was too well hidden, or certain spots had to be pressed in a certain sequence. Or possibly the activator for the opening mechanism was on the other side, and this opening was to be used as an exit only.

He went out from under the tapestry and started away when Barney's sharp metallic voice said, 'Doc!'

Doc wheeled and saw that the tapestry was sagging in the middle. Understanding at once what was happen-ing, he jerked his thumb at a group of large chairs against the opposite wall, and they quickly hid behind one of them. Doc passed out two more grenades to each of them but cautioned them in a whisper to use them only if they could not use their guns. Then he extended a slender flexible telescoping device under the chair and looked through it. But turning it on his end he could rotate the other end within 180 degrees and sweep the room. The end was uptilted, thus giving him a worm's eye view.

A red-headed man stuck his head out first. He was followed by six men, and then, through the doorway through which Doc and his friends had passed, twenty others came. Doc knew then how Iwaldi had disappeared so swiftly. He had taken a secret entrance in the wall of the outer room and gone through the tunnel to this room. The invaders had seen him and followed. Doc was glad that Iwaldi had not then cut back and taken Doc's party by surprise on the flank. But Iwaldi had not wanted to delay for anything. He had wanted to get away as fast as possible.

The invaders carried FN rifles and .45 automatic pistols, and four had hand grenades attached by the pins to their belts. There was even a bazooka team, one man with the tube and one carrying three rockets in a case on his back.

Doc made signs to Barney and Pauncho. They should let the invaders go on by. It was true that three grenades, thrown at once, could catch the whole party together and so dispose of them. But, though he had been compelled to fight them for the sake of survival, he did not know that they were basically hostile to him. Moreover, it would be best to use them to hound Iwaldi.

The party passed through the archway but left one man behind as a rearguard. Doc took out from a little box in his pack a ping-pong-sized, transparent ball and threw it when the man was looking the other way. The man spun on hearing the material break on the stone, looked around, then collapsed. Doc and his men had not even bothered to hold their breaths, since they were outside the influence of the vaporised curare. Doc sped to the man and applied the end of an air-operated syringe to his neck. He struck a sharp blow on the man's chest, and the man began to breathe again. But he was now unconscious and would remain so for half an hour.

Doc told Barney to return to the outer room and find where the secret entrance was. Pauncho appropriated all the man's weapons. Doc searched him for documents or other identification and found nothing. He was not even carrying a wallet.

The tapestry bulged, and Barney called out, 'I've found it!'

'Who couldn't?' Pauncho said. 'They left the door open, right?'

'I could tell you where to put the door, but I'm a gentleman,' Barney said, coming out from behind the tapestry. ‘I’ll define the term gentleman for you when we're not so busy.'

'Would you mind spelling it for me?' Pauncho said. He grinned at Barney. He looked like a chimpanzee who'd just seen a fresh banana. 'Hey, Doc, this Yale graduate's a real sooper-dooper speller. Did you know we were in Korea six months before he found out you don't spell it C-H-O-R-E-A? Haw, haw! Of course, he wasn't too far wrong. Korea was a disease, as far as us marines were concerned.'

'That's a disgusting lie!' Barney said. 'As far as that goes, you thought Korea was in the South Pacific, and you're a Berkeley graduate!'

Doc said, 'Stick something in that door under the tapestry. Not something big enough to make it stick out noticeably. We might want to use it for a getaway.'

Barney looked disgusted, but he was angry at himself for not having thought of the idea. And he did not like Pauncho's grin. He knew his squat buddy was telling him, silently, that he was a dummy.

Doc was thinking how much the two resembled their fathers. Yet neither had gone to his father's college or taken up their professions. Perhaps this was because they resented or even hated their fathers at the same time that they loved them. Both Porky Rivers and Jocko Simmons had been divorced by their wives because they spent too much time away from home on their adventures with Doc Caliban. Both women had remarried, and their husbands had adopted their stepsons. But the real fathers still had visiting privileges, and they came about four or five times a year to take the boys on trips. Doc had met them and even entertained them in his apartment high up in the Empire State Building or on his Lake George estate. The boys had grown up imitating their real fathers because they were mysterious adventurers who roamed the world and did all sorts of fabulous and dangerous deeds. They were the sons of men who had married late in life, and so they had fantasised that they would replace their fathers when these grew too old for the man-killing exploits demanded of them by close relationship with Caliban. The old men had finally retired. But then they had come out of retirement for one last great adventure in Africa, when Doc Caliban was on the trail of the man he believed had killed his beloved cousin, Viscount Grandrith, a man whom most of the world believed to be a purely fictional character and whom the world knew largely by a name that had originated in a non-human language.

Grandrith had not killed Trish Wilde. He had not even known of her existence when she was reported murdered by him. But Grandrith was mad at that time, insane in a peculiar way from the side effects of the elixir of immortality given to him by the Nine in return for certain services. Caliban was also insane because of the elixir's side effects. But he and Lord Grandrith discovered that they were half-brothers; and then Porky Rivers and Jocko Simmons died in their last battle at Castle Grandrith.