THE 9TH GIRL #1 New York Times bestselling author Tami Hoag brings back her fan-favorite Minneapolis investigators, Sam Kovac and Nikki Liska, in a haunting new thriller.  On a frigid New Year™s Eve in Minneapolis, a young woman is found brutally murdered—the ninth so far this year in a string of grisly slayings. Homicide detectives Sam Kovac and Nikki Liska fear that it™s the work of a serial killer they call Doc Holiday, a transient who has brought his gruesome game to a new and more terrifying level. But as Kovac and Liska uncover the truth, they find that the monsters in the ninth girl™s life may live closer to home. And even as another young woman disappears, they have to ask the question: Which is the greater evil—the devil you know or the devil you don™t?