The Guernsey Literary and Potato Peel Pie Society by Mary Ann Shaffer and Annie Barrows is an epistolary novel about Juliet Ashton's association with a fascination literary society that started due to the German Occupation of the Channel Islands during World War II. After corresponding with the members of the Society for several months, Juliet visits Guernsey where she finds an idea for a book, a daughter and a husband. The Guernsey Literary and Potato Peel Pie Society is a comical and heart-warming book which is entertaining overall.

While on tour through England to promote her book, Juliet receives a letter from Dawsey Adams, a member of the Guernsey Literary and Potato Peel Pie Society, and they begin to correspond. When she is asked to write an article for the "Times", she decides to include the Society in her article and thus begins writing to several other members, such as Amelia Maugery and Isola Pribby. Meanwhile, she begins dating Mark Reynolds, an American publisher. As Juliet develops close friendships with her Guernsey correspondents, she begins to wonder whether she can write a book about the Occupation, and she decides to visit Guernsey, despite Mark's protestations that she stay in London and marry him.

Though Juliet is nervous to meet her Guernsey friends, they make her feel welcome immediately, and she grows very close to them. When Remy Giraud writes to the Guernsey Literary and Potato Peel Pie Society about the execution of Elizabeth McKenna, their founder, Juliet mourns for the woman though they never met. Juliet keeps Kit while Amelia and Dawsey visit Remy in Touviers. Mark visits Juliet on Guernsey, but when he makes a disparaging remark about Kit, Juliet refuses him irrevocably because she cannot marry someone who does not love Guernsey and Kit. Juliet wants to adopt Kit so they can always be together, and Amelia offers to help obtain Mr. Dilwyn's approval. After Dawsey convinces Remy to come to Guernsey, Juliet wonders if Dawsey is romantically interested in Remy, and she admits to Sidney Stark that she loves Dawsey. When Remy decides to leave Guernsey, Isola Pribby becomes convinced that Dawsey loves Remy, but when she tries to find evidence, his treasure box only contains mementos of Juliet and Kit. Upset at her failed mission, Isola tells Juliet who immediately rushes to Dawsey and asks him to marry her. He agrees, so Juliet writes to Sidney to ask him to return to Guernsey and give her away.