خلاصه داستان : مستند «لبخند برای مردگان» به بررسی راز عکاسی روح ویلیام اچ. مام‌لر و نیاز جامعه بعد از جنگ داخلی آمریکا به او می‌پردازد.

1869: William H Mumler stood trial for fraud in New York for claiming to photograph spirits of customers' deceased loved ones. Mumler walked free as experts of the day could not figure his methods. Was he a fraud? Or could he truly photograph the dead?