This powerful documentary follows the world's most influential video artist Bill Viola and his wife and close collaborator Kira Perov over a twelve-year period as they undertake and complete the installation of two permanent video works, Mary and Martyrs, in St. Paul's Cathedral in London. In documenting Viola's approach, the award-winning arts documentary director Gerald Fox captures the essence of Viola's creative process, along with the significant changes that occur in these two figures over the lengthy time period. He also looks back at the career of this seminal artist, who since the early 1970s has taken video art to a new level of acceptance in contemporary art.