William Franklin is a teacher who was born in Ireland and moved to the United States only to repatriate in 1939 after his leftist political views cause him to lose his job. Franklin becomes the first non-cleric instructor at St. Jude's, a school for wayward boys run by Brother John, who is a firm believer in strong discipline.

Donal is a 14-year old who develops a passion for greyhound racing. He works in a kennel, which is owned by Good Joe. Good Joe promises Donal ownership of Donal's favorite greyhound, The Mighty Celt, if the animal wins three races in a row. Meanwhile, Donal's mother, Kate, must adjust her life when O, a man from her past, returns. The political climate of Ireland serves as the backdrop of this story.