This is a wonderful film, a Polish-French co-production.
It is exciting, tense, well-told and acted, and addresses real issues in society too but as part of the story and the characters - nothing is tacked on here.
The actor playing the main actor is superb, utterly believable in a tough transitional role. He nails it, and we believe he has a talent for speaking and connecting with people.
The story confronts many moral questions, of justice and what punishment should be, especially in such a brutal environment. I must say I was a big surprised Poland trains up criminals to be priests but, hey, maybe they have a shortage. Poland is very Catholic of course.
Like many dramas, going back centuries, the dramatic tension comes from if or when the imposter will be exposed and how that will happen.
The ending (no spoilers) may not satisfy some but it works for me.
5 stars. The best Polish film I have seen for ages.