All it takes is one message for Gemma's life to fall apart. A confirmation of all she's feared these last few months. Jack was supposed to be preparing for their new start in Australia, building their home, building their life together. And now this. Gone. Without a trace. Leaving their perfect world - all that their two-year-old daughter, Poppy, knows and cherishes - shattered. Crystal comes into Gemma's life at the opportune moment. This new friend, who's been through it before, who knows how it feels for all of your hopes and dreams to suddenly implode, who wants to help, who will do anything... Crystal loves Poppy. And Poppy loves Crystal. The minute they meet it's as if all of the heartbreak over her dad leaving dissipates. Poppy feels whole again. And in a way, so does Gemma. But what starts as a small kernel of jealousy soon grows into a larger sense of unease. Who is this woman who's so obsessed with her daughter? And why does it feel like there's something she's not telling her?