Amy's always felt like something’s been missing in her life, but as a nanny for the Laurent family - Julia, Alain, Viviane - she feels complete.

So Amy wouldn’t think of leaving them when a sudden tragedy forces them to move from France to the small lakeside cottage in the isolated Somerset village where Julia grew up.

But there’s something strange about the cottage by the lake. This is where Julia spent her childhood. But she used to have an older sister, Caroline, whom she rarely speaks about...

Who disappeared at just seventeen...

Who has a secret the whole village wants kept hidden for ever...