[video=youtube;Q1BK_1xfvK8]https://www.youtube.com/watch?v=Q1BK_1xfvK8[/video] Over the past 150 years, hundreds of people go missing from National Parks. A police investigator, started looking into disapearances, that do not fit logical explanation. Here is an interview with the books author. https://www.youtube.com/watch?v=Q1BK_1xfvK8