Plot: The mid 20th-century realist Edward Hopper’s enigmatic depictions of everyday Americana are celebrated for their ambivalence, dealing in not only the prosaic but also existentialist themes of loneliness and alienation - yet despite their popularity, surprisingly little is known about the artist's private life. For the first in a new run of the arts documentary strand, Alan Yentob travels to America to meet biographer Gail Levin and explore his love of cinema, the landscape of Cape Cod, and his complex relationship with wife and muse Jo