 Michelle Gallagher, Irene Hawkins and Barbara Bennett are three nuns on the verge of taking their final vows and just before they do, they are sent into a particularly rough neighborhood to see if they are ready to take that step. However, they must do so by pretending to be lay missionaries sent to work at an inner city clinic for a young doctor by the name of John Carpenter. The three nuns go about their duties without a hitch until Michelle begins to fall for John. Now Michelle must choose between her love for the young doctor or her life as a nun.