At the end of a decade when the world was in crisis and inspiration needed resurrecting, an influential duo released a masterpiece of popular music, Bridge over Troubled Water. Through darkness and light, the album takes its listeners on an emotional ride that echoes its era, and has proved to be a work that continues to inspire an audience the world over. Its symphonic hymn of a title track became an anthem for a generation. This film tells the story behind what is widely considered Simon and Garfunkel's greatest work. The influential duo's last studio album has its legacy shrouded in rock'n'roll mythology, complete with legendary tales of inspiration, innovation and separation. Paul Simon, Art Garfunkel and their collaborators share the journey in their own words and reflect back on its impact 40 years later, using never-before-seen film, photos and memorabilia.