LARIAT GIRL
From the book description: "A routine blood donation puts high school senior and gifted athlete Kenley Madson in the path of a twisted serial killer who collects women who resemble his dead mother. When her little brother is kidnapped and held for an unthinkable ransom, Kenley must choose between her freedom and his. The choice is easy. What comes after is anything but." Looking back, I gave some nice options on this one.