Sylvia and Kath, two active, gray-haired women, one a widowed artist, and the other an autistic intellectual, put down their paint brush, binoculars, and guidebook projects to investigate mysterious happenings in Yellowstone Park. Along the way, they encounter the deep conflict that exists in the park between preservation and public access, since humans have supplanted the gray wolf as top predator of the domain. They, their friends and family, become embroiled in the local controversies between individual liberty and balancing the ecosystem, while the overlapping dominions of state, federal, and local agencies further complicate matters, forcing them to contend with the authority of young park rangers, the local sheriff, and the FBI to solve a murder conspiracy that leads all the way to the governor's mansion.