Terrilli, who was 1,500 miles away on his Miami estate, lunched in his customarily spartan manner; just cottage cheese, salad without dressing and mineral water. Not once did he think of the people who were dying. It was a business matter, being satisfactorily resolved and therefore no longer necessary for any further consideration. Giuseppe Terrilli regarded such detachment as essential for the business he conducted.

The man who set out to be Terrilli’s destroyer never discovered the example killings. It would have been difficult, because Dean Warburger was in the Director’s office at the F.B.I. headquarters in Washington and the murders were in the northern Colombian province of Guajira.

But Warburger had learned that day of something else and his initial excitement was such to prompt a four-martini and lobster au gratin lunch at the Sans Souci. By four in the afternoon, Warburger had a bad headache, and realised that the intake was dangerous as well as premature and the proposal probably impractical. He authorised a feasibility study anyway.

It was the first time, after almost a year of exhaustive investigation, that he had become aware of Terrilli’s interest in philately. And Warburger, who was determined to make his directorship of the F.B.I. as legendary as that of J. Edgar Hoover, thought he had known everything that it was possible to uncover about Terrilli. Warburger usually disdained any dictum by which Hoover had ruled the Bureau, but on this occasion he made an exception. Hoover had said that personal secrets were weaknesses. It was the hope that Hoover was right which had caused the early Sans Souci celebration.

It took six weeks to steer the Lady McLeod of Trinidad towards a dealer through whom they discovered Terrilli had bought in the past. Warburger only became really excited when Terrilli made the purchase, because he had ensured that the theft of such a rare stamp as the Lady McLeod had been widely publicised. Having confirmed the weakness, Warburger refused to hurry, recognising it as possibly the only chance he would get. The indictment had to be unbreakable, with Terrilli provably involved in a crime. And that meant the bait had to be spectacular.