The Surrogate Mother by Freida McFadden

From the #1 Sunday Times bestselling author of The Housemaid, The Boyfriend, and The Tenant comes a story of monstrous motherhood. She gave you a life. Now she wants yours.

She was promised a miracle. She got more than she bargained for. Abby wants a baby more than anything.

But after years of failed infertility treatments and adoptions that have fallen through, it seems like motherhood is not in her future. That is, until her personal assistant Monica makes a generous offer to serve as a surrogate. It’s an offer that will make all of Abby's dreams come true.

But soon, strange things start happening. And it turns out Monica isn't who she says she is. The woman now carrying Abby's child has an unspeakable secret.

And she will stop at nothing to get what she wants.