Sydney, 1941: Olive and Ivy may be identical twins, but they couldn't be more different. While Olive is focused on marrying a man appropriate to her station, Ivy wants to do more, to be more. Joining the Australian Women's Army Service is the perfect chance for her to escape her family obligations and make a real difference in the world. She doesn't expect serving her country to lead to romance ... or devastating betrayal and unthinkable grief. As the war progresses, both Olive and Ivy find themselves wanting the same thing: for their loves to return safely. But neither of the Buchanan girls is ready for what the future has in store for them. Sydney, 2008: Escaping her husband's betrayal and an impossible personal loss, Madeline returns home to Sydney to nurse her broken heart. As she settles into her new routine, it's too easy to consider never returning to New York and her old life. But her husband won't give up on what they have so easily, and Madeline can't ignore his messages reminding her of why they fell in love in the first place. With her grandmother's support, Madeline has to decide if forgiveness means reconciliation. But is the biggest betrayal yet to come?