Lisa Harris 
Vendetta (The Nikki Boyd Files Book #1) [EPUB ebook] 

No one needs to push Nikki Boyd to excel on the Tennessee Missing Person Task Force. The case of her own missing sister, still unsolved after ten years, is the driving force in her work. When a Polaroid photo of a missing girl shows up at a crime scene, Nikki quickly recognizes similarities to the past. The closer she gets to the abductor, the more she feels that this case is getting personal, and that she is not the hunter at all–but actually the one being hunted.With this explosive first book in the new Nikki Boyd Files, Lisa Harris takes readers on a fast-paced pursuit of justice that will have them holding their breath until the heart-stopping finish.