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"The coastguard told me to put it next to the bins, not in it, because it stinks of fuel and they obviously don't want it to go up in flames if someone drops a cigarette end in there."

But the breakthrough came from an Embassy cigarette end stubbed out on an ashtray on the living room coffee table.

DNA found on her dress, inside the knot of the dressing gown belt, a cigarette end, and on a black bra all matched McGill, forensic scientist Joanne Cochrane told jurors.

In the 56 stories Conan Doyle wrote, the man who knew everything about everybody, who could deduce 17 things from a bit of mud and a cigarette end revealed so little of himself that he became the greatest mystery of them all.

The blaze started with a dropped cigarette end in a flat on the fifth floor.