Showing Hard Truth by Nevada Barr

Anna finds herself in a new job – that of District Ranger in Rocky Mountain’s National Park. Paul Davidson, her long-time love, is a thousand miles away. Dropped into the middle of a mystery that has had the park in a state of turmoil for six weeks, she at first thinks it’s solved itself … until the voices start … voices without bodies ... until the small slayings turn into bigger, and even the most obtuse administrator must realize something is desperately wrong in the mountains.