for Beyond by Graham McNamee
Sara Cole is not your typical teen. She and her best friend Lexi call themselves the Creep Sisters. Only Lexi knows why Sara is different from anyone else: Her own shadow seems to pull her into near-fatal accidents. Sara is determined to find out why these terrifying things happen, and to overcome her shadow enemy. Her sleuthing with Lexi connects her own horrors to the secret history of a serial killer.
Publisher description retrieved from Google Books.