During their travel from Chicago to New York, Harry and Sally debate whether or not sex ruins a friendship between a man and a woman. Eleven years later, and they're still no closer to finding the answer.

A lonely doctor who once occupied an unusual lakeside home begins exchanging love letters with its former resident, a frustrated architect. They must try to unravel the mystery behind their extraordinary romance before it's too late.

An orphaned musical prodigy uses his gift as a clue to finding his birth parents.

On a flight from Los Angeles to New York, Oliver and Emily make a connection, only to decide that they are poorly suited to be together. Over the next seven years, however, they are reunited time and time again, they go from being acquaintances to close friends to ... lovers?

Shortly after David Abbott moves into his new San Francisco digs, he has an unwelcome visitor on his hands: winsome Elizabeth Martinson, who asserts that the apartment is hers -- and promptly vanishes. When she starts appearing and disappearing at will, David thinks she's a ghost, while Elizabeth is convinced she's alive.