Dr. Mike Parker departs California to speak at a conference in New York. A widower, he and daughter Suzy have a deal with each other to never actually say goodbye. She remains behind with Miss Tucker, her governess.
While Mike is having a drink after the conference, a caricature artist, Victor, comes to Mike's table along with a woman who plays piano at the nightclub, Dorian Kent. To their mutual shock, Mike recognizes Dorian as his late wife, Lisa. Dorian flees into the street, where she is hit by a car.
While he waits for her injuries to heal, Mike recalls how they met in Vienna, Austria in 1945, when Mike was a US Army doctor. At that time, Lisa and Victor also had an act together as entertainers. Mike treated her for a sprained ankle and ended up marrying Lisa, who gave birth to Suzy. A jealous Mike, however, continually suspected Lisa of having an affair with Victor, and when she went to the Russian sector of the city to seek advice from her father, Lisa became trapped there when the border was temporarily closed and was never seen or heard from again.
Unwilling to renew their marriage but eager to see Suzy again, a recovered Lisa agrees to accompany Mike back to his home. The little girl misunderstands, however, believing her father is bringing home a new wife. She becomes hysterical. Later, she takes a dislike to Lisa and refuses to believe any suggestion that this is her real mother.
Victor visits and charms Suzy with his drawings. Mike gets an inspiration that Suzy should describe to the artist whatever memories she has of what her mother looked like. Lisa is about to leave when Suzy, having seen Victor's sketch, realizes who she is and calls out to Lisa to come back.
