In this fourth volume, unknown attackers begin launching assaults in Green Bay and nearly kill Claude Jolliet. A business war also erupts between the Murphy family and Tilden Foster's family. But the biggest problems arise from a flood on the Mississippi that inundates the primary shipping and supply center of Canada. Elise and Shawn have 14 days to get systems there running again before the economy of the country collapses. In the process they discover friends and foes as the conflict between the Catholic north and Protestant south escalates.