climax of the movie occurs in a fireworks factory

Rouhi, a young bride-to-be, is hired as a maid for an affluent family in Tehran. Upon arriving, she is suddenly thrust into an explosive domestic conflict. The wife is convinced her husband is having an affair and enlists Rouhi as a spy, to follow her husband, and confirm her suspicions. What Rouhi discovers, however, threatens not only their marriage but her own future.