Better guess: This is a : d→f, a→s, n→m, l→;, w→e, d→f → "fsm;ef" not helpful. Left shift: d→s, a→a, n→b, l→k, w→q, d→s → "sabkqs" no.**

But “film” shifted forward by 1: f→g, i→j, l→m, m→n → “gjmn” — not “fylm.” So “fylm” is “film” with y instead of i? That’s a vowel swap.

However, "Zero Dark Thirty" is a well-known 2012 film directed by Kathryn Bigelow about the hunt for Osama bin Laden. Given that, I suspect the phrase might be a (e.g., each letter typed one key to the left or right on a QWERTY keyboard).