Despite the darker edges, I, Tonya embraces the surreality of the story and winningly plays it mostly for comedy, with dips into drama, while crucially never mocking the central players.

It’s a serious blast, with a plot that zigs and zags (but only because it sticks, within reason, to the facts), and a cast of characters who are so eccentrically scuzzy that maybe no one could have dreamed them up.

I, Tonya succeeds because of the pathos it creates.

Robbie, for her part, has never been better. Making the most of her first leading role since Z for Zachariah, she does a brilliant job of skating along the thin line that runs between glory and the gutter. Sympathetic but not too sympathetic, her performance is all that allows the film to maintain its tenuous hold over its queasy tragicomedy.

While it’s a consistently entertaining and often poignant film which addresses a wide range of issues under the stealth cover of humour, I, Tonya also gives Robbie the chance – her first, really – to show her full range as an actress. And she shines.