Sanchez followed the golf buggy across a finely cut lawn and onto a wide gravel drive that led up to the house. Ross went over Plan A in his mind one more time. If Faulkner appeared when the front door opened, Ross would go to the back of the van to reduce the chances of his former fellow prisoner spotting him, while he looked as if he was supervising the unloading.

As soon as Faulkner began to follow the crate inside, the four armed policemen would grab him and handcuff him. Sanchez would then arrest Faulkner and read him his rights.

If there was even a hint of resistance from the two bodyguards, the police motorcyclists who were impatiently patrolling the motorway would spring into action and be with them moments later.

The front door opened, and a butler appeared. But there was no sign of Faulkner. It was never that easy. Ross moved on to Plan B.

Sanchez and Ross got out of the van, made their way slowly to the back and watched as Mr Benmore oversaw the unloading of the crate. He’d already complained to William about the four amateurs who’d taken the place of his professional technicians, but to no avail. After much grunting and groaning, the crate was finally lifted out of the van, and the four policemen followed Sanchez and the butler into the house, accompanied by Ross and Mr Benmore, while William remained out of sight. Still no sign of Faulkner.

Once the front door had been closed, William pulled a baseball cap low over his eyes, slipped out of the back of the van and took up his position behind the wheel, aware that he couldn’t risk being seen by Faulkner who would have recognized him immediately. He would like to have been the arresting officer, but he assumed that when the front door opened again, a triumphant Sanchez would reappear with the prisoner. Mr Benmore would no doubt become even more distraught when he discovered that the painting would be going straight back to Scotland; an agreement that had been brokered between the commander, the Home Office and the Spanish police.

The four policemen carrying their entry ticket made slow progress across the hall, while Sanchez chatted to the butler. Eventually they reached the drawing room, where a large, empty space on the wall above the fireplace marked the place where Fishers of Men would never hang.

The crate was carefully lowered onto the carpet, and the policemen stood back to allow Mr Benmore to set about his other job, which called on equal expertise. Unpacking.

As he began to extract the screws one by one, Ross slipped behind the open door so that if Faulkner made an entrance he would be ambushed.

Once all twenty-four screws had been removed, and the lid of the crate lifted, Mr Benmore removed the travel frame, followed by the layer of polythene that was stretched across it, protecting the surface of the canvas. After the job had been completed to his satisfaction, he instructed his untrained technicians to lift the painting gently out of its coffin by the four corners of its gilded frame. He must have repeated the word ‘lentamente’ a dozen times. Mr Benmore wasn’t used to repeating himself.