Wife: I couldn’t be prouder of my charming husband and quiet and kind son. I’ve poured everything into my little family, so I choose to ignore my husband’s late-night phone calls and wandering eye. I won’t let anything ruin my perfect life…

Then: Morning light shines into the nursery, casting shadows across the pale pink walls and wooden cot in the middle of the room. She opens the door expecting to hear the soft coo of her daughter, Sofia, stretching herself awake. But the room is silent. The cot is empty. Her little girl has vanished. Now: Twelve years have passed, but Emily will never forget the night her life changed forever, and she’s happy to have her daughter back beside her. A teenager now, Sofia started asking questions about when she was a baby.

Marianne has a life others dream of. A beautiful townhouse on the best street in the neighbourhood. Three bright children who are her pride and joy. Sometimes her past still hurts: losing her mother early, growing up in foster care. But her husband, Simon, is always there. A successful surgeon, he’s the envy of every woman they’ve ever met. Flowers, gifts, trips to France: nothing is too good for his family. Then Simon says another woman’s name. The way he lingers on it, Caroline, gives Marianne a shudder of suspicion, but she knows it’s nothing - she can’t entertain this flash of paranoia.

It’s been eleven years since high-powered attorney Sarah Morgan defended her husband, Adam, against the charge of murdering his mistress. Sarah has long since moved on, starting a family with her new husband, Bob Miller, and changing careers. Her life is back to being exactly how she always wanted … or is it?

On the night when Caitlin and Olivia's parents leave them to go to a dinner party both girls are full of excitement about being old enough to stay home alone. What they don't see is the figure watching them through the open window. Who, after the girls have fallen asleep, will turn the handle of the unlocked back door. When their parents return, they will find Olivia's bed empty. Their eldest daughter gone. Never to return. Until now. But is the woman who claims to be Olivia really all she seems? And is everything Caitlin said she saw that night really the whole truth?