Joan Fontaine, pianist, and Joseph Cotten, an engineer, are on the same plane bound for New York from Rome. Engine trouble forces the plane down in Naples. Both go sightseeing for a couple of hours.
They return to the airport just in time to see their plane roaring away overhead. More sightseeing together to Pompeii and Capri. They discover that the plane they were to have taken had crashed and that they are reported dead. They decide that since the world no longer believes they exist, they will start a new life together.
Fontaine gives a light touch to her role without becoming flirtatious. Cotten is always believable as the engineer who finds that running away from work and wife is not the answer to his restlessness and unhappiness.