Charles Boyer is well known of the American audience for he worked with the best directors:Cukor,Preminger,and more.
Robert Siodmak's "tumultes" has got a very good reputation in France:I must say I was a bit disappointed ;this director would do a better job with "pièges" some years later.
"Tumultes" 's conclusion is something like that: being in jail is awful,but living in the free world is still worse! The first part is not enthralling,IMHO,but things go much better in the second half: the sequences at the fair are film noir at its best : the fight between Boyer and his girlfriend's lover scenes, during a firework which becomes part of the action, compares favorably with those in Hitchcock's "strangers on a train" (which was released 20 years later!).That scene when Boyer takes out a knife and .. eats an apple ,in front of his terrified lover commands admiration too.
Interesting but not for all tastes.