Someone is watching Mia Hawkins. Mia doesn't know Jade. But Jade knows everything about Mia... In fact, she's turned herself into Mia's doppelganger. A doppelganger so convincing that when Jade is found dead, everyone believes the body is Mia's. A geeky academic underachiever who knows she isn't cool or glamorous, Mia can't work out why anyone would be obsessed with her - or why they'd end up dead. And the most terrifying question is: will Mia be next?