Former college sweethearts reconnect decades later after each has married, raised a family and forged careers and embark on an intense affair that forces them to confront the moral responsibilities of their love for their families and each other.

Genevieve (Gwen) Kingston's mother was diagnosed with terminal cancer when Gwen was just three years old. Defying the odds, she lived another eight years, during which time she filled a chest with gifts and letters to Gwen and her brother, Jamie, for every major milestone and birthday through age thirty. The day Gwen got her driver's license. The day she graduated from high school. Gwen is now in her thirties and, when Did I Ever Tell You? begins,...