So the Crown Prosecution has announced it will declare tomorrow morning whether or not Chris Huhne, Energy Secretary, will be charged in relation to allegations - steadfastly denied - that he persuaded his ex-wife to take speeding points on his behalf.
Huhne's statements on this have been unambiguous and robust, so if it turns out the CPS thinks there is a case to pursue he will be in trouble. A prosecution doesn't necessarily mean the man is guilty - he has the right to remain innocent until proven otherwise.
But the noises coming out of Downing Street and Lib Dem high command suggest a sword would quickly be offered for the Energy Secretary to fall upon. He could always use the old line of not wanting the whole business to be a distraction for the government, a position wholly consistent with protestations of innocence.
And indeed the CPS might well say there is insufficient evidence and Huhne can get on with his business (although there is no doubt he has been politically damaged by the accusations either way).
One reason why tomorrow's announcement is anticipated with inordinate excitement in Westminster is the high levels of pent up reshuffle energy. David Cameron has famously avoided swapping ministers between portfolios in the restless way that was Tony Blair's preferred management style. There were some movements and promotions when Liam Fox resigned last year but it was hardly a great re-ordering of the pack. There are good reasons why Cameron hates reshuffles. He wants ministers to actually master their briefs, which takes time. And he heads a coalition, which means a delicate balance of Lib Dems and Tories has to be maintained.
If Huhne has to go - and this is, I hasten to add, veering off a little prematurely into the realms of speculation - a vacancy would be created for David Laws to return to the cabinet, although it is uncertain he would want the Energy portfolio. There has been a fair amonunt of speculation that a lower ranking Lib Dem might up up for elevation. Edward Davey at the Business Department is often tipped for promotion.
But there is a feeling around government that it might, at last, be time for a more ambitious round of musical chairs. Crucially, anxiety about the passage and presentation of health reforms in Downing Street is approaching the status of panic. There is very little confidence left in Andrew Lansley, the Health Secretary, to explain to people what exactly it is he means to do to the NHS, let alone persuade them it is a good idea. Might a forced reshuffle provide an opportunity to put the Department of Health portfolio into a pair of hands somewhat safer than Lansley's have proved to be?