She melted back inside, letting the door close silently, and stood with her back to it, her heart’s hammering the loudest sound in London. He would hear her through the wood, and see the light beneath the door. Or put a hand to it and push, the automatic gesture of the guard on patrol, and when he encountered the resistance of her weight, it would be over. Alarms would sound, or whistles blow. Those meerkat cameras would turn and point, and her image would plaster itself over the monitors downstairs—six of them? The other guard, the one whose job it was to lean back in his chair and eat doughnuts, would reach for the telephone. And it would not be the police he would call, Harvey had left her in no doubt about that. The people whose building this was, whose secrets it contained, they looked after their own. The last thing they’d do would be call the police.

But he won’t see the light, she thought, because the lights are on in the corridor too. There’ll be no telltale yellow strip painting the carpet. This was just another door, the ladies’ loo, and why would he check that it opened? It always opened.

His whistling was familiar, a tune on the edge of her recall. It faded as he walked past, and the creaking of his tread on the carpet disappeared. The door he’d come through, from the lobby where the lifts and stairwells were, was off to her right, and if he completed a circuit of the floor he would not pass by again but enter the same lobby from the other side. But she didn’t know his routines, whether he might halt halfway and retrace his steps, or whether he was heading for a particular desk, or for the vending machine in the kitchen area . . . She could slip out now, and run into him three seconds later. Or this might be as close as their paths would come, and the fact that she’d just evaded him—had all but felt his breath on her cheek—might itself be a token that her safety was now assured.

Maggie, Maggie . . .

There were no tokens, no guarantees. But what was certain was that the light was currently on. Slipping into the corridor would cause nothing to change. As soon as this thought took hold of her she acted on it, standing upright, opening the door, stepping outside. The corridor was empty. Choosing the direction the guard had come from, she hurried round the corner to the lobby door.

She had spent hours in the toilet on the eighteenth floor. This was seven flights below where she needed to be, but that had been planned for—had been her own idea.

“If they catch me—”

(An outcome that had to be acknowledged.)

“—if I’m caught, at least they won’t know what I was really after.”