It all starts in the red place: the Senate. Earlier this year the entire Australian Senate was dissolved for the July election, meaning candidates didn't need as many votes as they normally would in order to get elected.
Then, two weeks ago, this guy, Family First senator Bob Day, announced he was resigning because his old business empire went bust (ironically it's a construction business).
The PM freaked out! Turnbull needed Day's vote on the ABCC and on the marriage equality plebiscite. So Bob Day walked back his resignation, telling everyone he'd hang around for a while.
Day will now be referred to the high court, which will decide whether he was qualified to have been elected or not. Now, if he wasn't, there'll be a recount of South Australian ballots which, in an unlikely scenario, may see the seat fall to Labor.
Then a subplot emerged. The recently departed solicitor general Justin Gleeson had foreshadowed a few weeks ago that the attorney general was "actively involved" in a matter to do with the composition of the Senate.
PSYCHE! It wasn't Bob Day! It turns out it was One Nation senator Rod Culleton!
So tl;dr: TWO senators are now facing the high court, with recounts in South Australia and Western Australia possible, and the Senate hangs in the balance.