I'm on my way up to Edinburgh to witness the dramatic conclusion of an election whose outcome still hangs in the balance.
Who would have guessed it? Who would have dared? A single seat in Scotland - Labour's historic heartland - the home of its next leader - could separate disappointment from disaster. Tonight Gordon Brown can only wait and watch to discover whether that result will deal him a bitter blow just weeks before he fulfils his dream of moving homes in Downing Street.
If the Nationalists do secure a historic first victory and if they can go on to form a governing coalition a Salmond-led Scotland could haunt a Brown-led Britain. A political civil war in Scotland will hardly help Mr Brown's efforts to reach out to Middle England.
If, on the other hand, Labour just holds on to power, the gasp of relief from Edinburgh will be felt hundreds of miles away in Westminster.
General elections are, of course, won and lost not North of the border but in England. Here, Labour's performance was poor - but it was marginally better than the results which preceded Tony Blair's election for a third term. The party is comforting itself that David Cameron's Tories - though clearly on a roll - are only just beginning to gain victories beyond their traditional heartlands.
And yet, they will know that winning a fourth term, led by Gordon Brown and not Tony Blair, up against David Cameron as against Michael Howard is a very very different proposition.
For the first time time in a decade the political future is unpredictable. Tonight it's game on.