A vacuum repairman moonlights as a street musician and hopes for his big break. One day a Czech immigrant, who earns a living selling flowers, approaches him with the news that she is also an aspiring singer-songwriter. The pair decide to collaborate, and the songs that they compose reflect the story of their blossoming love.

The world fell in love with Glen Hansard and Markéta Irglová when their songwriting collaboration in the film Once (2006) culminated in a jubilant Oscar win. But behind the scenes, where Glen and Mar’s on-screen romance became reality, a grueling two-year world tour threatens to fracture their fated bond. Filmed in black and white, this music-filled documentary is an intimate look at the exhilaration and turmoil created by both love and fame.