What is the setting of The Guernsey Literary and Potato Peel Pie Society by Mary Ann Shaffer?

The setting of this novel is in the real world, shortly after the end of World War II. Specifically, the novel is set in Guernsey in the Channel Islands, London, England and a little in France. The stories that are shared throughout the novel also reference concentration camps, both in France and in Germany. The characters are mainly divided into Islanders, those from Guernsey, and those who are not from Guernsey.