What are women detectives trying to prove? They always seem to be a little more irrational and impulsive than their male counter-parts. Rylie Wolf is out to solve the murder of her family and friends that she witnessed as a child. Is her sister, Maren, still alive? In the mean time, she has to work the cases in front of her as an FBI agent working in South Dakota, Wyoming, Montana. A serial killer is targeting good looking young women, kidnapping them, killing them, and leaving them on the side of "Highway to Hell" interstate 86. Wolf, and her partner, the ever cheerful Brisbane, are still working out how to work with each other. He totally has her six; can't say the same for her. This story is intense and we get to see the thinking, false leads, and leg work that go into finding a killer, hopefully before the latest kidnapping becomes the latest death. For all her baggage and flaws, I like Rylie Wolf. She is on my must read list.