So he stopped hating the packed carriage, and rubbed shoulders with an extraordinarily pretty young woman until Westminster, where, despite the temptation to keep travelling, he finally alighted. Tourists were already busying themselves with the day’s chores, cameras and video cameras trained on the Houses of Parliament and Big Ben. Hepton headed up Whitehall and realised suddenly that he didn’t know which of the large, anonymous buildings he needed. Understated signs beside the impressive doors were the only indication as to their identity. A man was striding purposefully towards him, black briefcase in hand. Hepton recognised the style of the briefcase: soft leather, more a school bag than a business case. There was a small crown above the nameplate. He had seen visitors from the MoD carrying such bags when they came to the base. He stopped the man.

‘I wonder if you can help me,’ he said. ‘I’m looking for the Foreign Office.’

The man said nothing; merely indicated with his head before walking on. Hepton stared at the building towards which he had nodded, then started towards its arched main door.

ALL PASSES MUST BE SHOWN declared the sign just inside the doors. Below it, another notice advised that security alert was condition Amber. Security alert was normally at Black. Hepton knew this from his own dealings with the MoD, though Binbrook had its own, different grading system. Above Black came Black Special, which meant there was cause for caution, and after Black Special came Amber. Amber was what government departments had gone to after the Libyan bombing. Amber was serious, only marginally less serious than Red. Hepton had never seen a Red alert, and, knowing what it meant, hoped he never would.

The uniformed guard was eyeing him suspiciously.

‘Can I help you, sir?’

‘I hope so,’ Hepton said. ‘I’d like to speak with someone about a friend of mine. This friend is in the United States, and it’s vital that I contact him. Is there anyone here who might help?’

‘Why not just phone your friend, sir?’

It was a fair question. Remembering Paul Vincent and Harry, however, Hepton knew that speed was of the essence. He hadn’t time to muck around, to engage in little games of ‘let’s pretend’. He needed to get past this first obstacle quickly, and he knew of only one sure way to do it.

‘Well,’ he said, ‘it’s not quite that simple. You see, he’s Major Michael Dreyfuss, the man from the shuttle crash.’