When a broken film critic must find the most ascetic Persan director and persuade him to shoot an unrestrained blockbuster in Paris, he pick the wrong man and have to deal with him to save his career.

'Who' is this "wrong man"; knowing 'who' he is, tells the audience the Hero has to go on a dififficult Journey. There's no Batman without the Joker.

Hey FFF, I think there is a very good improvement in the logline by every update. You will still need to go back and think about the story (which is totally normal).

Weak points to me:
- Why is the director Persian? Is there a special reason behind this not counting the location setting for audience?
- Why Paris? Are there a lot of Persian people in Paris? Or are Persian people in love with the city of Paris? Etc.
- How come he picks the wrong guy? Accidentally? Is there an impostor?

Maybe this could help:

A broken film producer's last hope is to persuade a Persian director to shoot a blockbuster action-movie in Paris, but he is fooled by an impostor. Discovering this too late, he has no choice but to start the shooting with the false man.

Thanks everyone, I made a last attempt to sum up the main story. Is the logline acceptable in this last attempt? Interesting? I think my movie may have some structure problems : maybe it's not enough "confined" (paris/middle east),

1st act, the film critic accepts to try to find the Persan director (even if he have no clues),

1st part of 2nd act : the search in the Middle East mountains and the meeting with the impostor.

middlepoint : the deal with the impostor.

2nd part of 2nd act : shooting the movie in Paris

3rd act : resolution (the whole movie is a fraud and the critic leave to go looking for the real director)

Thanks again, I wait for an eventual last feedback, then I'll go back thinking about the whole thing.