Wolves were hunted to near extinction by the 1920s, but in recent decades, conservationists have brought wolves back to the Rockies. Here Nate Blakeslee tells the gripping story of one of these wolves, O-Six—an alpha female beloved by wolf watchers—who became an improbable social media star. Threatened by hunters, ranchers, and other wolves, O-Six was caught between those fighting for a vanishing way of life and those committed to restoring one of the country's most iconic landscapes.