The FBI of the National Park Service

The 33 special agents assigned to the Investigative Services Branch handle the most complex crimes committed on NPS land. When a day hike in Rocky Mountain National Park ended in a grisly death, ISB veteran Beth Shott hit the trail, where she began unraveling a harrowing case.
Read more: https://www.outsideonline.com/2353856/national-park-service-investigative-services-branch?source=Snapzu