Dornstein ushered me up to the third floor, where two cramped rooms were devoted to Lockerbie. In one room, shelves were lined with books about espionage, aviation, terrorism, and the Middle East. Jumbo binders housed decades of research. In the other room, Dornstein had papered the walls with mug shots of Libyan suspects. Between the two rooms was a large map of Lockerbie, with hundreds of colored pushpins indicating where the bodies had fallen. He showed me a cluster where first-class passengers landed, and another where most economy passengers were found. Like the coroner in a police procedural, Dornstein derives such clinical satisfaction from his work that he can narrate the grisliest findings with cheerful detachment. Motioning at a scattering of pushpins some distance from the rest, he said, “They were the youngest, smallest children. If you look at the physics of it, they were carried by the wind.”

In May 1968, Ronnie and Reggie Kray were arrested. Their Old Bailey trial the following year was, at 39 days, the longest murder trial in English legal history at that time; the press and public galleries were both packed. The twins denied everything, but the Blind Beggar barmaid, thereafter known as “Mrs X”, gave damning evidence and the renegade members of The Firm did the rest. Ronnie gave a spectacular but crazed performance in the witness box, name-dropping the boxing champions they knew and portraying himself as an innocent East End philanthropist. They were jailed for life and a minimum of 30 years by Mr Justice Melford Stevenson, who told them that “society has earned a rest from your activities”.

There was to be little rest from the twins, who continued to promote their image as England’s No 1 gangsters so diligently. And that remains the great enigma about the Krays: the fame they craved ensured that they would be a target for the police, and yet they staged their crimes where they would be guaranteed an audience; the men they believed were totally loyal were the ones who ensured their downfall. Once jailed, they devoted their considerable energies to their image as gangland stars, always open to visitors from outside.