Mia doesn't know Jade. But Jade knows everything about Mia ... so much so that she's turned herself into Mia's doppelganger. A doppelganger that's so convincing that when Jade is found dead, everyone believes it was Mia. A geeky academic underachiever who knows she isn't cool or glamorous, Mia can't work out why anyone would be obsessed with her â" or why that would be so dangerous. Worse, Mia realises that Jade wasn't the only person with a secret obsession. Someone else has been paying far too close attention to her, and gradually turning Jade into Mia. If Mia can't work out who the link is between them, she risks becoming their next victim.