The might-have-been of a human life is much more real to us than its routine dailiness. In a Brooklyn brownstone room, an elderly Irishman, more emigrant than ex-pat, dwells on a freeze-frame moment from half-a-hundred years before. The Americans are shooting Moby Dick on the harbour-front in Waterford in the Marian year, and a teenage thirty-bob film extra is about to fall for another. It's not as vast a venture as Captain Ahab's Odyssey. Even so, the boy from the borstal and a girl called Clara dream of the big-time, if not the big screen, and a new life in the New World. But there's only a hairline fracture on the lens between Once Upon a Time and Then One Day.