Zoe and Ollie Morley tried for years to have a baby and couldn't. They turned to adoption and their dreams came true when they were approved to adopt a little girl from birth. They named her Evie.

Seven years later, the family has moved to Yorkshire and grown in number: a wonderful surprise in the form of baby Ben. As a working mum it's not easy for Zoe, but life is good.

But then Evie begins to receive letters and gifts.

The sender claims to be her birth father.

He has been looking for his daughter.

And now he is coming to take her back...

Sanjida Kay is a writer and broadcaster. She lives in Bristol with her daughter and husband. Bone by Bone was her first thriller.