Life as Augusta Rockwell knows it changes once she unearths a box of old letters written by her estranged husband, Nick Flemming, the love of her life and the father her children have never known. She's told her daughters that their absent father was actually a spy, which is why he couldn't be part of their lives. But the letters reveal that Nick has secretly been keeping tabs on his family all these years from afar -- a discovery that while shocking, has the potential to mend the fractured and wayward lives of the three Rockwell sisters.