It started on a cold December day with a cabin-fever-induced plan to drive every county road in rural Whitman County, in southeastern Washington State. Two and a half years, 658 roads, and probably 10,000 miles later, Martha Mullen completed her journey. She has explored cemeteries and recreation areas, hiked trails and climbed buttes, eaten in small town cafes, attended community events and celebrations, and listened to people's stories. Along the...