Scott’s final cut – was painstakingly assembled from original elements, including the original 65mm negative. De Lauzirika has been working on it over a seven-year period. “And this time, Ridley approved every single thing that went into it – every single cut, every single effect,” he says. “We’re right back to square one,” Galvao says of The Final Cut elements. “We scanned the cut negative, plus the negatives we dug out of vaults in England, here at Warner Bros., and [co-executive producer] Jerry Perenchio’s vault as well. We went through and viewed every frame of every roll that we could find.” “Honestly, I got to go through 977 boxes and cans of mag, IP, INs, 65mm visual effects comps, 35mm original dailies … everything ever printed,” de Lauzirika says.

He tried to explain what drew him to his computer. “When I’m talking to Cindy or you like this, face-to-face,” he said, “it’s hard for me to say what I feel.” As Tommy, however, the words came easily. And then there was Jessi. He loved her, or at least believed he loved her, though he knew he was “never going to meet her.” His plan was to “kill Tommy off” in Iraq, but Cindy intervened too soon. He nearly committed suicide because of his guilt about having lied to Jessi.

‘Consider the pace at which the story unfolds. Nobody is in control of it, which means it occasionally gets quite dull. We can’t fast forward or time-switch. We’re not invited to phone in and vote for which suspect we would like to see arrested. Key scenes and pieces of information are kept from us in a way that would defeat the point of a show like Big Brother. But we find this all the more compelling. The one nod to conventional broadcasting principles is that the ratings have mattered right from the beginning. When there was a risk that they might slump, David Beckham was drafted in to speak on the matter, thus giving the story a new boost. Most grippingly of all, we have no idea what genre of story we are watching, so have no idea how or when it might end.’

Suddenly we have to hold two entirely contradictory thoughts in our head at the same time. For the McCanns have now either suffered the cruellest fate imaginable – not only to have innocently lost their beloved daughter but also to have been publicly accused of a wicked crime – or they are guilty of the most elaborate and heinous confidence trick in history, deceitfully winning the trust and sympathy of the world’s media, a British prime minister, the wife of the American president and even the Pope, to say nothing of international public opinion. One of those statements, both of them extraordinary, describes the truth. As a senior tabloid journalist put it to me yesterday: “They’re either the victims of a horrible smear which they will never fully escape or they are cold, psychotic killers” responsible for the death of their own child.