Don Tillman is a successful genetic scientist who always followed logic and avoided any surprises. Even in his search for a life partner, he used a scientific approach with clear requirements, until he met the capricious and spontaneous Rosie Jarman. Now Don and Rosie are a happy couple living in New York. And everything was fine until his lover announced that she was pregnant. The scientist has no idea what parenthood is, and when he investigates this issue, he gets into trouble with the law, which he hides from his wife. Many trials and tribulations await the couple, as well as testing the strength of the marriage, which can fundamentally change the heroes.