Nevada Barr is an ex US Park Ranger. She writes the Anna Pigeon mystery/thriller series. Each book takes place in a different national park. This book takes place in Glacier National Park and Anna is doing a DNA bear training/study project. The bears make the story really scary and the plot line keeps you trying to guess who done it and why. I read the as a audio-book and the reader, Barbara Rosenblat, is one of my favorite readers. If you have never read Nevada Barr you should.