The movie turns into the ultimate procedural, in which computer work, matching photographs, and one seeming irrelevancy after another in an old interrogation video lead Maya to a man known as Abu Ahmed, who, at regular intervals, drives a white S.U.V. from Peshawar to a house in Abbottabad.
According to Mr. Norman's website, he reached into his bottom drawer for a song he had already written for an aborted musical called "A House For Mr. Biswas, " based on the novel by V.