Fagin was studying one of the computer screens. He pressed a few buttons, then studied the screen again. ‘There’s a fifteen-minute access alarm on the interface,’ he explained quietly. ‘And it’s just gone off.’ He turned to Villiers, his eyes twinkling with humour. ‘Somebody’s trying to out-sting our own little sting.’

‘Can you stop it?’ Villiers sounded wary.

‘Oh yes. Every time the intruder makes a move, I’ll just order the computer to make another. A bit like chess. Strange, though. He’s in, but he’s not doing anything.’

As Villiers peered at the computer screen, Dreyfuss knew he had to make his own move. But Villiers wasn’t his target: Fagin was. Fagin could wreck everything. He had to take him out. He threw himself forward and grabbed the scientist, pulling him to himself as a shield, then backed away. Villiers was already aiming his gun, undecided whether to risk the shot.

Fagin saw his hesitation. ‘For God’s sake,’ he pleaded.

Villiers stared at him, then at Dreyfuss. Finally he brought his gun arm down, but then angled it away from Dreyfuss and his prisoner and began raising it again. Directly at Jilly’s head.

‘I think,’ he said stonily, ‘this is what’s called an impasse. Except that you, Major, can do nothing with your hostage except hide behind him. While I, on the other hand, won’t hesitate to shoot mine.’

And to prove it, he turned his head away from Dreyfuss towards Jilly, taking aim and beginning to squeeze the trigger.

‘No!’ Dreyfuss pushed Fagin aside and started forward again. But he was too far away from Villiers, far too far away. The gun moved in an easy sweep until it was pointed directly at him. The explosion in such a confined space was deafening, but the impact in Dreyfuss’ chest was silent. He felt himself propelled backwards with great force, until, with a new and sickening sound of shattering glass, he slammed into and through one of the dividing walls.

Shards sparkled in his hair as he lay on the floor, a red stain spreading rapidly across his shirt. Villiers examined him through the sizeable hole in the glass wall, seemingly content, then turned back into the room. Fagin looked ghostly white, smoothing strands of hair back across his gleaming pate. And Jilly Watson … well, she was staring at Dreyfuss’ still body with wide, tear-brimming eyes and horror carved into her cheekbones. Seeing this, Villiers smiled at her with a face that seemed to be transfigured before her very eyes, becoming quite mad and more dangerous, even, than ever.

But now Villiers’ attention was drawn to Fagin. ‘Don’t just stand there!’ he roared. ‘Get to work! Let’s see who stops Martin Hepton first: you with your computer, or Harry with her gun.’