"Act of Grace" tells the separate but connected stories of two Irish-Australians and their experience of war and romance. Reardon is a rear-gunner on bombers flying over Nazi Germany. His sister, Perpetua, is a nun in New South Wales faced with the unexpected dramas of monastic life while hoping for her brother's survival. William Coyle is the pseudonym of a bestselling novelist who divides his time between London, Australia and New York.