Investigating judge Iman grapples with paranoia amid political unrest in Tehran. When his gun vanishes, he suspects his wife and daughters, imposing draconian measures that strain family ties as societal rules crumble.

"Mother married a photo of Father," says director Firouzeh Khosrovani in the opening of this deeply personal documentary. She's not speaking metaphorically though. Her mother Tayi literally married a portrait of Hossein in...