Sister Mary Helen and her dear old friend Sister Eileen can't believe their luck when they win a free trip to Santiago, Spain. Surely the contest, held by the nervous owner of a Spanish restaurant where the nuns sometimes dine, must be rigged? Or was there a bit of intervention - divine or otherwise - that secured the two sisters places in a small tour group? Never mind. The sisters are far too excited at the thought of beautiful faraway Spain to worry unduly and decide.

To count their blessings instead. There's certainly an interesting group of fellow pilgrims traveling with them, including a melancholy professor and his wife, a woman clearly frantic to look ever-youthful; the arguing Bowmans, who grate on everyone's nerves; the dentist and his bouncy wife, so into aerobic exercise; and the two misfit young women, peculiar friends given that one of them is a beautiful temptress, the other a lonely, sullen lump of a girl. Unfortunately,

Sister Mary Helen's luck seems to take a turn for the worst not long after she arrives in Spain. On an early morning visit to the famous cathedral in Santiago, she stumbles upon the strangled body of one of the tour group. Suddenly everyone comes under suspicion as the police start their investigation into the lurid crime. Meanwhile, Sister Mary Helen can't keep from nosing around to see if she can solve the murder. But strange - and frightening - things begin to happen.

To Sister Mary Helen not long after she discovers the body. Increasingly it seems that someone is stalking the intrepid nun. Does the murderer simply want to put an end to her amateur sleuthing before she solves the mystery? Either Sister Mary Helen must come up with the murderer's identity - and fast - or all the prayers in the world can't save her!