Twelve-year old William and ten-year old Rebecca have come to live with their family at a lighthouse on the edge of Lake Michigan in Door County, Wisconsin in the 1920s.The lighthouses of the Great Lakes played a crucial role in guaranteeing the safety of the many ships that sailed the sometimes treacherous waters of the "inland seas" and the members of the Lester family soon find themselves facing a series of adventures and dangers climaxing with a terrible catastrophe that threatens the lives of the entire family. An intermediate reader for ages 9-12.