Detainee 001 is a carrot-and-stick sort of documentary. The carrot is elusive “American Taliban” John Walker Lindh, captured as an enemy combatant during the November 2001 invasion of Afghanistan.

The stick comes when the movie ends, and we realize that Lindh remains pretty much the same cipher wrapped in an enigma smothered in secret sauce that he was before the film (the very title is misleading, considering that Lindh was captured simultaneously with 85 other prisoners).

I'm always wary of documentaries about a living person wherein that person is nowhere to be found. Director Greg Barker doesn’t interview Lindh (who appears exclusively in archival footage that turns out to be underwhelming regardless of how “never-before-seen” it may be), and how he could he?; by his own admission, Barker has no idea where Lindh even is.

This is what ultimately sinks the film, which is ironic because it’s also what could have saved it if only Barker had seized the opportunity to make an In Search Of-type doc. Can't speak directly to Lindh? Then talk to his parents, siblings, uncles, cousins, any relative you can get ahold of.

Talk to his friends, and if he doesn't have them (which wouldn’t surprise me), talk to his former classmates and teachers. Give us, for lack of a better term, the dude’s 'origin story'.

The one interesting little thing we learn about Lidh's past is that Malcolm X (the movie, not the activist) inspired him to convert to Islam, and even this doesn't get the follow-up it deserves — not even a cursory 'we reached Spike Lee for comment but he wouldn’t return our calls.'

Barker, however, shows as little interest in Lindh's formative years as curiosity as to what has become of him since his release from prison. I'm not saying you must perforce discover his whereabouts, but there’s a very good chance that just looking for him would shed some light on the motives behind his actions. What’s in the documentary is not entirely without merit, but it lacks a through line connecting the beginning, the middle, and the end.