My life has never been better. I have a beautiful little girl, and I am engaged to be married to the man I've had a crush on since I can remember.

So when Nick, my handsome fiancé, announces that his sister Carla is finally coming home, it's truly the icing on the cake.

Carla was my best friend growing up until she ran away at sixteen. That was twelve years ago, and no one has seen her since.

Everyone is ecstatic about Carla's return. But as I spend more time with her, I can't shake the feeling something isn't right. Her behaviour is a little off, her childhood memories don't align with mine, and she's oddly evasive about her lost years.

But no one will listen to my concerns - not Nick, not Carla's mother, Marjorie, not even our old friends. They all say I'm imagining things. But I can tell something is wrong. And before long, I know without a shadow of a doubt...

It's not her.