Not for the first time, Nicky Hager has tossed a big stick of dynamite with a short, fast-burning fuse into the midst of an election campaign.
As was the case with Hager's revelations surrounding genetic engineering, which came close to derailing Labour's 2002 election campaign, the contents of his latest book, Dirty Politics, are - to say the very least - explosive.
Hager's book goes to the heart of the Government - the Prime Minister's office on the ninth floor of the Beehive - and finds something very rotten in the State of Key.
Hager's allegations are many and varied. They are extremely serious. But one stands out. The allegation that one of John Key's minions hacked into the Labour Party's database is - to put it bluntly - the modern-day equivalent of the 1972 burglary of the Democratic Party's national committee headquarters in the Watergate complex in Washington.
And everyone knows whose head rolled at the end of that saga.