Three Documentaries to Stream: Opera, Chile, Teen Detectives

This month's documentary streaming picks cover an unusually wide span: an unfinished opera, an excavation of Chilean history, and a group of teenagers investigating environmental wrongdoing.

The selection, announced as this month's curated picks, groups three films around unfinished business — artistic, historical and ecological.

The first pick centers on an opera that was never completed. The film follows the story of the work and the circumstances that left it unrealized.

The second documentary turns to Chile. It excavates the country's history, examining a past that remains contested and unresolved.

The third film follows teenage environmental sleuths — young investigators tracking environmental questions of their own.

Together the three documentaries share a preoccupation with what has been left incomplete or unexamined: a musical work cut short, a national history still being dug up, and an environment whose problems a new generation is taking upon itself to investigate.

All three titles are available to stream this month.