When Gina Bianchi returns to the beautiful Italian resort of Portofino to attend her father's funeral she is beset by vivid memories of World War 2 when she joined the Resistance alongside her identical twin sister Adele. In her childhood bedroom Gina reads Adele's diary left behind during the war. As Gina learns the shocking truth about her sister she's compelled to face the harsh realities of her own past.