Ryland Grace is the sole survivor on a desperate, last-chance mission - and if he fails, humanity and the Earth itself will perish. Except that right now, he doesn't know that. He can't even remember his own name, let alone the nature of his assignment or how to complete it. All he knows is that he's been asleep for a very, very long time. And he's just been awakened to find himself millions of miles from home, with nothing but two corpses for company.

Three years ago, nurse Zoe's son Ethan was found drowned in a muddy river by their home, along with his best friend, Josh. With no witnesses, their deaths were ruled a tragic accident. Heartbroken, Zoe and her family move away from her home. They’re just beginning to get back to some kind of normality when, out of the blue, Zoe receives an anonymous email: "You need to find out the truth about what happened to your son. Don’t let this rest. Don’t believe the lie." Shaken, Zoe starts an obsessive hunt for the truth.

Eve wanted nothing more than to be a mother. She and her husband, Aidan, planned to have a family, but with each devastating miscarriage her hopes dwindled. When she eventually gave birth to her daughter, Kayla, it should have been the happiest time of her life. Instead, it was a waking nightmare for Eve and one she was desperate to escape. Now, Eve has left all that behind. She pretends that she never had a child and keeps her secrets close. But someone knows the truth. They know that Eve told a lie, and the clock is ticking before her shocking decision is revealed.

Tara Logan adores her perfect little family: husband, Noah, and two children, teenager Rosie and 11-year-old Spencer. But her happiness is shattered when she wakes in her neighbour Lee Jacobs' bed, with no memory of how she got there or what happened between them. And worse - he has been stabbed to death. Convinced she didn't kill Lee, Tara flees home and stays silent, holding her breath as the investigation grips the neighbourhood.

Mia Hamilton lived the perfect life with her husband, university teacher Zach, and their two-year-old daughter. But everything changed when Zach committed suicide on the same night one of his students vanished. Five years later, just when Mia is beginning to heal, stranger Alison walks into her life, saying her husband didn't kill himself. Fragile, slight Alison leads Mia on a path into Zach's past, and Mia begins to think she never really knew her own husband.