When Alison's beloved daughter Amalie drowns, her world turns impenetrably dark. Alison tries to hold it together throughout the bleak Fall, but in the darkest days of the Norwegian Winter, she completely falls apart. In another family, Amalie's passing is a new beginning. After years of severe health problems, young Kaia receives a new heart on the morning after Amalie drowns. Her mother Iselin has struggled to raise Kaia on her own, and now things are finally looking up. She's even made an affluent new friend who's taken a special interest in her and her daughter. As her grief transforms into a terrifying obsession, Alison won't let anything stop her from getting back what she has lost.

Cecilia Wilborg has it all --- a loving husband, two beautiful daughters and a gorgeous home in the affluent Norwegian town of Sandefjord. However, one mistake from her past could bring it all crashing down around her. Annika Lucasson lives a dark life with her abusive, drug-dealing boyfriend. She's lost everything one too many times, and now she has one last chance to save herself, thanks to Cecilia. Annika knows her secret --- and just how much she's willing to do to make it all go away. When someone forgets to pick up their little boy at the local pool, Cecilia agrees to take him home, only to find an abandoned, empty house. It's the first step in the unraveling of her meticulously crafted life, as her and Annika's worlds collide.