The third novel featuring national park ranger Anna Pigeon finds her dealing with three mysteries in Colorado's Mesa Verde National Park: an inexplicable illness that's infecting visitors, a child's mysterious death, and the murder of a friend. Reissue.

The third novel featuring national park ranger Anna Pigeon finds her dealing with three mysteries in Colorado's Mesa Verde National Park: an inexplicable illness that's infecting visitors, a child's mysterious death, and the murder of a friend. Reissue.

Lately, visitors to Mesa Verde have been bringing home more than photos--they're also carrying a strange, deadly disease. And once it strikes, park ranger Anna Pigeon must find the very human source of the evil wind.