‘It’s a lucky break I went back for this. They won’t hear the shooting, and maybe I can wipe them out before they know what’s hit them.’

A sudden crackling of undergrowth made Baird swing around. He caught sight of a prison guard coming down the path. He had a revolver in one hand and in his other hand he held a chain that restrained a massive Alsatian dog that was dragging the guard down the path.

Baird hadn’t time for any fancy shooting. He got the rifle to his shoulder as the guard saw him. If the guard hadn’t been pul ed off balance by the dog he would have got Baird, but Baird fired a fraction of a second before the guard could get his gun sight on Baird. The rifle slug hit the guard in the centre of his forehead. He dropped in his tracks, his dying ringers releasing the chain.

The dog didn’t hesitate. It came down the path like a black streak of lightning. Baird hurriedly levered another slug into the breech and fired again, but the dog was coming too fast for accurate shooting. Baird’s shot went wide, and before he could fire once more, the dog was on him.

Baird stabbed at its massive chest with the barrel of the gun, but force of the dog’s charge sent the rifle out of his hands. Baird grabbed hold of the dog by its throat, throwing back his head to avoid the white fangs that slashed at him.

Man and dog rolled over and over, down the path towards the river bank. It was all Baird could do to keep the brute away from his throat. He screwed his fingers into the loose skin around the dog’s throat and hung on, while the dog clawed at his chest with its front paws and tried to get close enough to snap.

Rico lay motionless, sick with horror. He knew he should go to Baird’s help, but he hadn’t the will to move.

Baird tried to choke the dog, but its heavy brass-studded collar protected its throat. He rolled over, dragging the dog with him, not daring to release his grip for a second. The dog was incredibly strong: it was like holding on to a tiger. Baird realised his grip was slipping. The white fangs were now snapping within inches of his face. He made a tremendous effort, half reared up and threw himself and the dog into the river.

The warm, muddy water closed over his head. One of his hands lost its grip, but the dog was under the water too, and was more anxious to get to the surface than to snap at Baird. They both came to the surface together, and as Baird found his feet, he grabbed the dog by its collar with both hands and shoved it under the water again.

The struggling animal churned up the water into foam. It was as much as Baird could do to hold it.