After their father's death, sisters Vanessa, Ellie, and Georgiana are stunned to learn a well-kept family secret. A yellowed letter tucked away in a family Bible reveals that the woman who gave birth to their late father had not died when he was born, as they had always believed. Their paternal grandmother gave up her son shortly after his birth, leaving this note with instructions to never reveal her name or background to him. The letter is signed, simply, Hattie.