For decades, the residents of Libby, Montana have lived a double life.
On the outside, the town of 3,000 people along the Kootenai River is a picture postcard of why western Montana is one of the most gorgeous places in the country.
Unseen, though, is how asbestos pollution from a former W.R. Grace & Co. mine has sickened more than 1,300 residents with a deadly lung disease, killing many of them and turning Libby into the deadliest Superfund site in the nation's history.