He's the kind of child you want to give back.

Tess has long wondered if Freddie, her difficult youngest son, isn't hers. Ginger, pale and freckly, he looks nothing like the rest of the family, and even her own children notice the cold way she treats their naughty sibling.

But Tess never expected that she might actually be right. Until a twist of fate reveals the terrible truth: during her IVF treatment, Tess's embryo was mistakenly swapped with a stranger's. For the past two years Tess and Annie, the other woman, have been unknowingly raising each other's children.

When Tess meets Willow, the daughter she so desperately craved, she becomes determined to reclaim the child as her own - demanding she and Annie swap their children back, regardless of the emotional cost. But Annie refuses to contemplate letting go of the beloved little girl she brought into the world.

As the two wrangle, an unanswerable question is posed.
Whose child is whose?