'Lord Dorincourt had occasion to wear his grim smile many a time as the days passed by. Indeed as his acquaintance with his grandson progressed he wore the smile so often that there were moments when it almost lost its grimness.'

When young Cedric Errol's father dies he becomes heir to the fortune of his English grandfather the Earl of Dorincourt and must move from working-class New York to England. Bad-tempered cantankerous and bitter the old man is slowly won over by the kind generous and cheerful spirit of Cedric.

When a plot arises to deprive Cedric of his inheritance and another pretender steps forward as heir Cedric's friends in America become involved in order to thwart the challenger. Through Cedric's unconditional love and trust he teaches his grandfather to show compassion to those who are less fortunate than himself.