With nuclear war looming, a military expert in underwater acoustics strives to prove things aren't as they seem—or sound—using only his ears.

After four years apart, Ahmad returns to his wife Marie in Paris in order to progress their divorce. During his brief stay, he cannot help noticing the strained relationship between Marie and her daughter Lucie. As he attempts to improve matters between mother and daughter Ahmad unwittingly lifts the lid on a long buried secret...