In Benjamin Percy's new thriller, a post-apocalyptic reimagining of the lewis and clark saga, a super flu and nuclear fallout have made a husk of the world we know. A few humans carry on, living in outposts such as the s...In Benjamin Percy's new thriller, a post-apocalyptic reimagining of the lewis and clark saga, a super flu and nuclear fallout have made a husk of the world we know. A few humans carry on, living in outposts such as the sanctuary-the remains of st. Louis-a shielded community that owes its survival to its militant defense and fear-mongering leaders.