They would have been wrong. God, in the Towers, had known Gibbons the length of his professional career, would have judged him a man of insight and acumen, but handicapped by a throw of the dice: those damned events that could derail any intelligence officer’s career. He might appear a buffoon, might cultivate that image, might use it as a cover to divert attention from the reality of a stiletto-sharp mind. He trekked into the heavier rain as the afternoon closed dankly on Central London.

The Underground behind them, they passed the entrance to the Ritz Hotel, then skirted the south side of Piccadilly Circus – neither looked up at the Eros statue – and turned down into Haymarket. She came level to his elbow and murmured the number they should look for. He nodded. They were a team. The rain’s drips fell regularly from his hat brim and her hair was soaked, but they made no small-talk about the awfulness of the weather. Probably her mind was swamped as his was with the enormity of what they hoped to achieve in the next hours and days – not weeks.

There was a doorway and, inside, newspapers were scattered instead of a mat. A man in commissionaire’s uniform sat at a desk but they were not challenged and declined to use the lift. Instead they walked up two flights and slipped along a corridor of closed doors, none of which boasted the legend of a company or business. She had a Yale and two mortise keys out of her handbag and he stood at the side while she unfastened the door. Gibbons did not know when the Service had last used the premises, whether they were regular or occasional visitors. He assumed that a front company held the lease and that all connections to the Towers were well disguised. Old procedures died hard. No interior lights were switched on until Sarah had gone to the windows of both main rooms, the kitchenette behind a partition, the toilet and shower room and pulled down the blinds. There was a room with a desk, a chair, and a small settee for him, and a room with a desk, chair, portable TV and a folded single bed for her; there were cupboards for each of them, a safe with a combination lock.