Al Larson has spent 35 years building and monitoring nest boxes across the western United States to bring back a bird that was disappearing from its range: the bluebird. Now in his nineties, he still climbs into the field to check boxes by hand, and the film follows him through that work with the quiet attention of someone who has done it every season for decades. Interviews with Larson sit alongside footage of all three North American bluebird species, tracing how a self-taught hobbyist turned into one of the country's most persistent citizen conservationists. The film treats his longevity as part of the subject, letting him talk through what four decades of fieldwork have done for him as much as for the birds. It also makes an implicit case for citizen science itself, showing how one person's box-monitoring habit, kept up long enough, can move a species' numbers. The scenery is incidental; the nest boxes and the man checking them are the point.