Juliet Ashton tours England promoting her wartime writing and searches for a new book project after the war ends.

A Guernsey farmer named Dawsey Adams writes to Juliet about her old Charles Lamb book, starting their correspondence.

Dawsey describes how a secret roast pig dinner ran past German curfew, and Elizabeth McKenna invented a literary society as cover.

Juliet asks the Guernsey Society members to contribute to her Times article about the role of literature during the Occupation.

Mark Reynolds proposes marriage to Juliet after only two months of courtship, but she declines to give an immediate answer.

Sidney encourages Juliet to travel to Guernsey to research the islanders' wartime experiences firsthand.

Juliet arrives in Guernsey and meets the Society members on the pier for the very first time.

A letter from Remy Giraud arrives confirming Elizabeth McKenna was executed at Ravensbrück for defending a fellow prisoner.

Dawsey and Amelia travel to France, find Remy gravely ill in a hospice, and invite her to come to Guernsey.

Dawsey tells Kit that her mother Elizabeth has died, while Juliet watches and is reminded of her own parents' deaths.

Mark arrives unexpectedly in Guernsey and kisses Juliet in front of Dawsey, who quietly says goodnight and leaves.

Juliet confronts Mark and delivers a final refusal of his marriage proposal after he dismisses her bond with Kit.

Juliet tells Amelia she plans to adopt Kit, and Amelia weeps with relief and promises to help.

Isola searches Dawsey's home and discovers hidden pictures of Juliet, her letters, her blue ribbon, and her handkerchief.

Isola shares her discoveries with Juliet, who goes directly to Dawsey and proposes marriage; he accepts wholeheartedly.

Shortly after World War II ends, Juliet Ashton is touring England to promote her wartime writing while searching for a new project. A letter from a Guernsey farmer named Dawsey Adams draws her into the world of the Guernsey Literary and Potato Peel Pie Society and the story of the island's German Occupation. As the Society members share their experiences, Juliet navigates a pressured romance with the charming but domineering American publisher Mark Reynolds, who proposes marriage after only two months. She travels to Guernsey instead, where she falls in love with the island and its community, and is shattered when a letter from a concentration camp survivor confirms that the Society's beloved founder, Elizabeth McKenna, was executed. Juliet refuses Mark's proposal for good after he dismisses her growing bond with Elizabeth's orphaned daughter Kit, and she resolves to adopt the child. After Juliet's friend Isola discovers hidden proof of Dawsey's feelings, Juliet takes her chance and proposes marriage to him, and he accepts.

Juliet's journey from London writer to Guernsey bride.

Mark Reynolds tracks down Juliet's book tour itinerary and sends her ostentatious bouquets of flowers at every stop.

Reporter Gilly Gilbert attempts to expose Juliet's failed engagement to the deceased Lieutenant Rob Dartry in the press.

Amelia Maugery writes cautiously to Juliet, worried that Juliet's playful writing style might ridicule or mock the Society.

Juliet provides Amelia with two character references: a reverend who admires her and a former fire warden who does not.

Amelia tells Juliet how Elizabeth bought every available book the morning after curfew to make the literary society real.

Eben Ramsey writes to Juliet describing how German soldiers grew crueler over time and stripped Guernsey of food and firewood.

Adelaide Addison writes an unsolicited letter urging Juliet not to write about Elizabeth McKenna or associate with the Society.

Eben reveals that Amelia secretly hid the roast pig from German authorities by swapping a dead pig's death certificate with a living one.

Micah Daniels writes about the day a Red Cross ship arrived with desperately needed food parcels for Guernsey's starving residents.

Juliet attends her first Guernsey Society meeting, where Jonas Skeeter presents on Marcus Aurelius and debates self-doubt with a fellow member.

Henry Toussant writes to Juliet about women from occupied territories who were forced to work in the German soldiers' brothel.

Sidney visits Guernsey and writes to his sister Sophie that Juliet seems more alive and like herself there than she has been in years.

A graphologist confirms that childhood letters Isola's grandmother received from a kind stranger were written by Oscar Wilde.

Billee Bee tries to flee with the Oscar Wilde letters, but Isola and Kit seize them and lock her in the smokehouse.

Remy encounters a large dog in town and suffers a violent traumatic reaction, vomiting uncontrollably as Dawsey catches and holds her.

While Juliet is on her book tour, Mark Reynolds tracks her down by obtaining her itinerary and courts her with flowers, while a tabloid reporter tries to dig up scandal about her past. Juliet must work to earn the Society's trust by providing character references and reassuring Amelia about her writing intentions. Through letters from Eben, Adelaide, and others, she builds a layered picture of daily life under German Occupation and the moral compromises it demanded. Once she arrives in Guernsey, she attends her first Society meeting, learns from Henry Toussant about the island's darkest secrets, and watches Sidney visit and assess the community she has come to love. A subplot involving the possible discovery of Oscar Wilde letters is resolved with Isola's characteristic flair when she traps Sidney's scheming secretary in her smokehouse. The pool closes on the depth of Remy's trauma, made viscerally clear when an encounter with a dog leaves her violently ill on the street.

The wartime letters, community details, and supporting events that fill out the story.

Juliet confesses to Sidney that her engagement ended because her fiancé boxed all her books and replaced them with sports trophies.

Isola writes to Juliet revealing that Elizabeth had previously been sent to prison in France for hiding an enslaved Polish worker.

John Booker writes explaining how he impersonated his employer Lord Penn-Piers throughout most of the Occupation to conceal his Jewish heritage.

Juliet sends all the Guernsey correspondence to Sidney and wonders aloud whether the Society should be the subject of her next book.

Dawsey tells Juliet how he and the German soldier Christian Hellman formed an unlikely friendship through their shared love of Charles Lamb.

John Booker is exposed as an impersonator by an islander and deported to Neuengamme, where he is forced to dig mass graves.

Sidney reveals to Isola during his Guernsey visit that he is gay and therefore cannot be a romantic partner to Juliet.

Sidney reads Juliet's manuscript chapters and tells her the book lacks heart and must instead be centered on Elizabeth McKenna's life.

Amelia reveals that Christian Hellman once visited her home to express his honorable intentions toward Elizabeth, changing Amelia's view of their relationship.

Peter Sawyer tells Juliet how he and Elizabeth nursed a starving teenage Todt worker in hiding, leading directly to Elizabeth's arrest.

Juliet learns that Elizabeth gave Eben's grandson Eli her father's WWI medal as a secret protective charm before his wartime evacuation.

Dawsey tells Juliet that Guernsey is not helping Remy heal and that she would be better off returning to France.

Sidney tells Juliet that her anguish over Dawsey and Remy's closeness proves she is in love with Dawsey, and she admits it.

Juliet and Dawsey share a private dinner and she discovers he has her book on Anne Brontë, deepening her feelings for him.

Kit opens her closely guarded secret box and shows Juliet mementos left by both her deceased parents, including a note from Elizabeth.

The story's most pivotal revelations begin early, when Juliet admits her engagement collapsed not from heartbreak but because her fiancé boxed all her books without asking. As the correspondence deepens, she learns that Elizabeth's imprisonment predated her deportation to the camps, and that John Booker survived most of the Occupation by impersonating a fled English lord at Elizabeth's urging. When Sidney visits Guernsey he delivers two crucial truths: he is gay and cannot be Juliet's partner, and Juliet's manuscript is directionless and must center on Elizabeth's extraordinary life. The pool then traces how Juliet uncovers the human complexities behind the Occupation, from the story of a hidden Todt worker to the revelation of a quiet act of wartime kindness Elizabeth showed a frightened child. Finally, Juliet's own emotional life snaps into focus when Sidney names what she has been refusing to admit, and a private dinner with Dawsey and the discovery of Kit's secret box of family mementos confirm the life she truly wants.

The hidden discoveries and emotional shifts that reshape everything Juliet believes about love, war, and herself.