Verona in the 1950s. Don Stefano, the chaplain of San Lorenzo, was once a passionate race car driver and tennis player. Deeply affected by his wartime experiences, he decided to become a priest. He has given up racing, but now and then he still plays a game of tennis, preferably with the wealthy art dealer Catani, whose family he is friends with and in whose home he is a frequent guest. His connections to the Catanis have also enabled Don Stefano to place his protégé, Gilda, a young girl in need, with them as a housekeeper. However, Signora Catani gradually becomes suspicious of the fact that Gilda wears a new yellow rose on her dress every day. She believes the girl receives the flowers from her husband; that he is her secret lover. This leads not only to a heated argument between the couple but also to a confrontation between the lady of the house and the maid.