Benedict, Edgar, and Jerome are the last remaining Sisters of Infinite Grace, who serve the tiny Irish fishing village of Donadon. Their bishop is evicting them from their old convent overlooking the sea, to install a group of monks in their place. Monks! The women are horrified. And besides, the convent and prime seaside land belong to them. The bishop offers them a pittance for the property, but a land developer offers them more. Despite their vow of poverty, the sisters decide the higher offer must be God's will. The battle is on! The dastardly bishop pulls out all the stops to thwart the sisters' sale, but he fails, and the property goes to the land developer. The disobedient nuns now find themselves wealthy, but with no home and no mission to follow. Thus begins their odyssey, in their expensive new sunflower-yellow convertible, to discover their true mission.