When part-time model and full-time prostitute Luciana Vetra is asked by one of her most exalted clients to pose for a painter friend, she doesn't mind serving as the model for the central figure of Flora in Sandro Botticelli's masterpiece "Primavera." But when the artist dismisses her without payment, Luciana impulsively steals an unfinished version of the painting--only to find that somone is ready to kill her to get it back. What could possibly be so valuable about the picture? As friends and clients are slaughtered around her, Luciana turns to the one man who has never desired her beauty, novice librarian Brother Guido. Fleeing Venice together, Luciana and Guido race through the nine cities of Renaissance Italy, pursued by ruthless foes who are determined to keep them from decoding the painting's secrets.