The story revolves around a husband who delivered his wife's twins in the middle of a snowy night. One was a perfect little boy, the other was a little girl who had downs syndrome. In the 1960's they didn't know much about Downs and didn't expect them to live a very long life. He decides to tell his wife that the second baby died during birth and has his assistant whisk the little girl away to a special home.
I won't give away anymore but it deals with how a lie can fester and how not talking about things can completely ruin a relationship. You watch as David and Norah's relationship strains over the "death" of the daughter over the years as well as what actually happens with the daughter and her brother living in separate worlds.
I think the thing that resounded with me the most was that there isn't always time to "fix" things. That sometimes it is in fact too late and that sometimes things we don't want to face need to be dealt with and as promptly as possible. Definitely check it out!