A definitive exploration of singer-songwriter Leonard Cohen as seen through the prism of his internationally renowned hymn, "Hallelujah." This feature-length documentary weaves together three creative strands: the songwriter and his times; the song's dramatic journey from record label reject to chart-topping hit; and moving testimonies from major recording artists for whom "Hallelujah" has become a personal touchstone. Approved for production by Leonard Cohen just before his 80th birthday in 2014, the film accesses a wealth of never-before-seen archival materials from the Cohen Trust including Cohen's notebooks, journals and photographs, performance footage, and extremely rare audio recordings and interviews.