Do you know the truth about Lockerbie? - Robert Fisk

After writing about the "ravers" who regularly turn up at lectures to claim that President Bush/the CIA/the Pentagon/Mossad etc perpetrated the crimes against humanity of 11 September, I received a letter this week from Marion Irvine, who feared that members of her family run the risk of being just such "ravers" and "voices heard in the wilderness". Far from it.

For Mrs Irvine was writing about Lockerbie, and, like her, I believe there are many dark and sinister corners to this atrocity. I'm not at all certain that the CIA did not have a scam drugs heist on board and I am not at all sure that the diminutive Libyan agent Megrahi – ultimately convicted on the evidence of the memory of a Maltese tailor – really arranged to plant the bomb on board Pan Am Flight 103 in December 1988.

But I take Mrs Irvine's letter doubly seriously because her brother, Bill Cadman, was on board 103 and died in the night over Lockerbie 19 years ago. He was a sound engineer in London and Paris, travelling with his girlfriend Sophie – who, of course, was also killed – to spend Christmas with Sophie's aunt in the United States. Nothing, therefore, could be more eloquent than Mrs Irvine's own letter, which I must quote to you. She strongly doubts, she says, Libya's involvement in the bombing.

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