Hearts of the World by Michael O'Brien. A passionate tale of rivalry and collaboration at the time of the birth of cinema. Told through a fictionalised account of the relationship between two key players in the awakening of the cinematic age: Mary Pickford , the Canadian actress known as America's sweetheart with her childlike innocence and curly, blonde hair, and DW Griffith , the movie director described by Charlie Chaplin as "the teacher of us all".