Where to start? So much has been written about the Pangbourne Massacre, as it is now known in the popular press throughout the world, that I find it difficult to see this tragic event with a clear eye. In the past two months there have been so many television programs about the thirty-two murdered residents of this exclusive estate to the west of London, and so much speculation about the abduction of their thirteen children, that there scarcely seems room for even a single fresh hypothesis.

However, as the Permanent Secretary impressed upon me at the Home Office this morning, virtually nothing is known about the motives and identity of the assassins.

"I say 'assassins,' Doctor Greville, but there may have been only one of them. I'm told that some sort of martial arts fanatic could have got away with it." Sitting beneath the portrait of his more illustrious predecessor, he gestured gloomily. "And as for the whereabouts of the orphaned children-they've vanished through some window in time and space. Not a ransom demand, or even a simple threat to kill them…"

He sounded almost aggrieved, and I commented: "All the same, I think we should assume that they're still alive."

"Should we? To be honest, Doctor, I'd rather you didn't assume anything. That's why I've asked you here."

He stared at me without hope, already regretting the decision. As we both well knew, the fact that I had been called in by the Home Office, after my unpopular minority report on the Hungerford killings, was less a compliment to me than a comment on the failure of the police, the CID and the intelligence services to come up with even a solitary clue to the sources of this horrific crime.

As baffled as the Permanent Secretary, I could only think of asking his permission to visit the murder site at Pangbourne Village. The luxury housing estate was still sealed off from the press and public, but had been tramped over by an army of heavy-footed investigators. I waited as he scribbled my _laissez-passer_, my arms burdened by two Home Office briefcases loaded with their probably useless files. Then I remembered the comfortable seats of the viewing theater in the Whitehall basement, and as an afterthought asked if I could see the police video recorded at Pangbourne within a few hours of the crime.

"The police video? All right, but it's pretty grim stuff. Though after Hungerford, I daresay you have the stomach for this sort of thing, Doctor…"

Irritated by his tone, I almost declined. The senior people at both the Home Office and Scotland Yard regarded me as a dangerous maverick, overly prone to lateral thinking and liable to come up with one embarrassing discovery after another. Later, looking back as I revise these diaries for publication, I realize that it was there, in the deserted viewing theater, that I was given my first glimpse into the real causes of the Pangbourne Massacre. If I failed to recognize what I saw, and if over the course of my investigation I seem unduly slow to identify the culprits, I can only plead that what now appears self-evident scarcely seemed so at the time. My failure to recognize the obvious, in common with almost everyone else concerned, is a measure of the true mystery of the Pangbourne Massacre.