London, 1806. William Thornhill, happily wedded to his childhood sweetheart Sal, is a waterman on the River Thames. Life is tough but bearable until William makes a mistake, a bad mistake for which he and his family are made to pay dearly. His sentence : to be transported to New South Wales for the term of his natural life. Before long Thornhill, a man no better or worse than most, has to make the most difficult decision of his life.