Gina has fallen in love with her sister's neighbor, Sean, to the point of parking outside the home he shares with his wife and young daughter. She is not sure why this happened or even how. She loved her husband but this affair has now consumed her. Although he spends a lot of time with Gina, Sean continues to live at home because of his daughter.
The Forgotten Waltz is a story about how families get on with life. Gina marvels that Life hasn't stopped to marvel at her joy with Sean or cry at the loss of her Mother. Life still goes on. And people need to get on with life also.
After her Mother dies, Gina goes to live in the house she grew up in. This forces many memories of her life growing up. Gina tells the story of her life with Sean and begins to see her growing years with her Mother and Father differently. As Sean focuses on his daughter, Gina sees her and her sister's lives through the eyes of her Father who died when she was in her teens.
Gina concedes that her viewpoint is one sided when it comes to Sean. Why can't he spend all of his time with her? Because she doesn't have children of her own, she views Sean's daughter almost as an adversary keeping her Father away from Gina.
Almost a coming of age story for a woman in her thirties, Gina has to learn that her life does not exist in a vaccum. She has to learn to live with the others who surround her.