Most Pennsylvanians are familiar with the story of William Penn and the founding of Pennsylvania in 1681 as a haven for religious dissenters. But few may know what became of Penn's enterprise in the years after his death in 1718. And fewer still realize that Penn's descendants played an important, and increasingly unpopular, role in the coming of the American Revolution to Pennsylvania. The Storm Gathering, based on Penn family correspondence and other contemporary records, tells this fascinating story, focusing primarily on Thomas and John Penn.