After millions of years of evolution, treacherous migrations, and forming a unique relationship with humans, North America’s largest swallow species, the Purple Martin, has managed to become almost completely dependent on man-made nesting structures to nest & rear their young. Captain Zach Steinhauser has taken it upon himself, after spending years guiding folks to North America’s largest Purple Martin roost, to chase these birds across their range to understand exactly how this species put themselves in this position and discover a lost culture of bird-loving enthusiasts across the Purple Martin’s range. Zach’s journey takes him across the western hemisphere from the Great Lakes to the Amazon Rainforest all the way to the Sonoran Desert making unexpected connections at every turn. While he makes new discoveries with leading experts from around the world, he ultimately discovers conservation’s greatest hope for a more sustainable future.