Kassie and Wally have been friends since their school days. One day, Kassie reveals that she feels her biological clock ticking and is considering getting pregnant with a donor's sperm. She finds a donor, and one of her other friends throws a party to commemorate the occasion. However, Wally gets deeply affected and, in a drunken stupor, he switches the donor's sperm sample with his own. Seven years later, Kassie returns to New York, and Wally gets to meet her son. Slowly, memories start resurfacing, and Wally realizes what he has done and what Kassie is unaware of.
The movie isn't exactly flawless, but it turns out well nonetheless, largely thanks to the performances, and the production is more Hollywood than Hallmark.