After Light spans four generations of the Garrison family, over the course of the twentieth century. Irish Deirdre, forced into marriage at sixteen, never stops trying to regain her freedom, though her ruthless escape attempts threaten to destroy her family. Her son, Frank, raised in Brooklyn, is a talented young artist, until he's blinded in WW2. With fierce determination, Frank forges a new life for himself, but the war has shaken him...