Emily Webb is a geek — and happy that way. Content hiding under hoodies and curling up to watch old movies, she’s never been the kind of girl who sneaks out for parties. And she definitely doesn’t start fights or flirt with other girls’ boyfriends. Until one night Emily finds herself doing exactly that... the same night a classmate — also named Emily — is found mysteriously murdered.
The thing is, Emily doesn’t know why she’s doing any of this. With every nightfall, she gets wilder until it’s no longer just her personality that changes; she’s also becoming strong, fast, and utterly fearless. Has she been bewitched by the soul of the other, murdered Emily? Or is she becoming something else entirely — something not human?
As Emily hunts for answers, she learns that she’s not the only one this is happening to — other teens are changing as well. Who is turning them into monsters, and how many people will they kill to get what they want?