Dr. Lilian Chance has wanted to study wild animals since childhood and was able to make her dream come true - now she has a reserve and a zoo in it. But her childhood friend and first love Cooper Sullivan III, against the will of his father, did not continue the family business, but became a private detective. Returning to the lands of his ancestors, located near the reserve, Cooper discovered that a mysterious stranger was constantly spying on Lillian. Cooper will have to confront a ruthless killer - a maniac who chose Lillian as his next victim.

The book was also published under the title “Black Hills.”