Ah, the movie will focus on one of the most intriguing episodes of QMI's reign, the pretender.
QMI's reigned on behalf of her son, she was never a monarch in her own right.
When he died suddenly, she faced a crisis. She no longer had a mandate to rule.
So surprisingly fast she adopted a new son, Erik of Pommeren = Pomerania. (Who became king after QMI's death.) And just as surprisingly that was accepted!
She had a very secure position and she had a very broad backing in order to pull that one off. A testament to how skilled a politician she was.
Anyway, later on there were rumors of a young man, claiming to be the son of QMI and as such the rightful king of the Nordic Union.
Through her diplomatic channels QMI arranged for him to seized by the Teutonic Order and brought to her.
I doubt very much he would have shouted, unless he was insane.
He was interrogated and exposed as an imposter (he would have confessed to anything, oh yes!) and subsequently burned at the stake - a strong political signal.
I do not believe for a second that QMI was for one moment in doubt as to whether her real son had actually died or not or whether this man might be her son.
IMO he never stood a chance anyway. There were none who were really interested in backing someone unknown. Even if he had been QMI's true son, he would IMO have been burned anyway as a usurper. Too many political interests against him.
But who were behind him? No one just turns up out of the blue, with all the detailed knowledge about QMI's son without someone well informed backing and training him. It has been suggested that it was a group of Norwegian nobles who were against the Kalmar Union, and who hoped, through this man to take control over at least Norway.
No one knows.
Years ago I translated an article by a renowned Danish historian about this subject, I think it might serve as a guide for what is the basis of this movie.
And an "obituary" at QMI's death: