Karina Wood, having become a widow at the age of thirty and having given her stepdaughter in marriage, takes an oath not to marry again. Some time passes, and at the request of her relatives, an Italian businessman settles in her house for a short time. Soon Karina realizes that she has fallen in love with him, but behaves very dryly towards the guest. For businessman Luigi Gatti, her actions remain a mystery until he unravels the secret that the heroine has been hiding for many years...