Comprised of only a handful of scenes and even fewer lines of dialogue, this experiment in ambient sound design is minimalist even by Naderi`s extreme standards. It`s also marks a return to the child protagonist films the director made in his native Iran. Fending for himself in an indifferent city, Jesse (Charlie Wilson), a deaf-mute boy, searches for the remaining traces of his dead mother, a radio talk show host who left behind a collection of audio cassettes in a Brooklyn warehouse. As in all of Naderi`s films, sound editing is crucial, and Sound Barrier gradually builds to an aural tour de force set on a congested bridge. Exhilarating and exhausting?with a finale that is quite literally an epiphany.