The Perfect Stepmother by Karen King

She seems too good to be true. And now she lives in your home. 
Lily wants to be happy for her father when he tells her he's getting married again. Even if it feels too soon after the death of Lily's mother. He's madly in love with Maria. And he thinks she's going to be the perfect stepmother to Lily's much-younger sister, Emma. 
And perhaps he's right. Because no one seems to have a bad word to say about Maria. It's only Lily who can't trust her. Who thinks no one is that perfect. Who notices no one had ever heard of Maria until exactly ten years before. And then Emma goes missing. 
A totally gripping and unmissable psychological suspense novel about dark family secrets, perfect for fans of Shalini Boland, Claire McGowan and Gone Girl.

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