A source close to A24 said the film’s scope, commitment to its subject and its novel-esque storytelling convinced the studio to pursue the deal.

He became convinced that Dahl had broken under the relentless questioning of detectives who had been trained to use deception and aggressively pursue confessions once they had identified a suspect.

"He's been a survivor, and he hasn't done what's normal. Will normal - whatever it is - fall into place this time? Perhaps, but I'm not convinced."

At the time, Gascón told The Times that he was “convinced that not only are they innocent, but we believe we might know who committed the murder.”

But the lack of proof of the abuse Caroline is convinced was inflicted on her has led her to say she is "the forgotten victim" of the trial.