The Tailenders is a captivating look at a missionary group's use of ultra-low-tech audio devices to evangelize indigenous communities facing crises caused by global economic forces. Global Recordings Network, founded in Los Angeles in 1939, has produced audio versions of Bible stories in over 5,500 languages, and aims to record in every language on earth. The film traces their journeys in the Solomon Islands, Mexico, India and the United States, where they distribute the recordings, along with hand-wind audio players, to "the Tailenders": the last people to be reached by worldwide evangelism.