With Prime Video’s The Summer I Turned Pretty set to air its third-season finale on Wednesday, Sept. 17, viewers are turning to Jenny Han’s novels for clues about how the story of Belly (Lola Tung), Conrad (Christopher Briney) and Jeremiah (Gavin Casalegno) might conclude. Han has previously signaled that the television adaptation will diverge from the books in places, but the final volume of the trilogy, We’ll Always Have Summer, provides a clear resolution in print: Belly ultimately marries Conrad after a time apart and a long exchange of letters.
In the novels, the reconciliation is framed by distance and correspondence. After Belly and Jeremiah call off their engagement, Belly goes abroad for college and spends time in Spain, where she receives regular, handwritten letters from Conrad. Those letters, sent once a month, keep the two connected despite their physical separation and help set the stage for their eventual reunion and marriage.
We’ll Always Have Summer opens a few years after the breakup and moves toward a flash-forward: Belly is pictured on her wedding day, not yet 30 but in her early 20s in the book’s timeline, marrying a man who is "solid and steady and strong" and who does, in fact, have the last name Fisher. The wedding sequence in the novel culminates with a characteristic, cinematic moment: amid rain, Belly and Conrad drive to the ocean, park on the sand, run into the surf and celebrate their marriage there.
The book also preserves the emotional continuity of the series through Susannah’s voice. In Han’s trilogy, Susannah writes letters to Belly for both her own family and for moments in Belly’s life; one such letter is read aloud in the television adaptation earlier in Season 3. In the novels, Susannah’s letter to Belly for her wedding day imagines Belly as radiant and settled, married to a "man with kind eyes" and urges her to "be happy. Be good to each other." The letter reads, in part:
Dearest Belly,
Right now I am picturing you today, on your wedding day, looking radiant and lovely, the prettiest bride there ever was. I picture you about thirty or so, a woman who’s had lots and lots of adventures and romances. I picture you marrying a man who is solid and steady and strong, a man with kind eyes. I am sure your young man is completely wonderful, even if he doesn’t have the last name Fisher! Ha. You know that I could not love you more if you were my own daughter. My Belly, my special girl. Watching you grow up was one of the great joys of my life.
Following the wedding-day flash-forward, the book includes an epilogue that collects five of the letters Conrad wrote while Belly was abroad. Those letters, and Belly’s later handwritten reply to them, are shown to have lasting significance for the couple. In the epilogue, Belly recounts that Conrad kept the letters in his wallet, "soft and creased into a million little folds," and that the pair eventually hung an old Fisher family photograph in their living room.
The television adaptation does not mirror the novels page for page. Ahead of the Season 3 premiere, TSITP’s creator warned viewers that there would be surprises and changes from Han’s texts. Season 3 introduces new characters, new writing and new settings; the show sends Belly (and on-screen, Conrad) to Paris rather than Spain, and the series incorporates additional plot threads not present in the books, including scenes that suggest a possible medical emergency and a Valentine’s Day flashback. The differences mean the show’s final beats were not certain from the outset.
Nonetheless, the central emotional arc in the novels — a breakup, a period of distance maintained by letters, a reunion and a marriage — has been a reliable guide for readers and now for many viewers. In print, Jeremiah attends Belly and Conrad’s wedding with an unnamed date; he and Belly exchange a brief, knowing gesture across the lawn. The book concludes with a sense of domestic continuation rather than a dramatic coda: the letters that sustained them become objects of memory and a marker of the relationship’s endurance.
Prime Video’s series kept elements of that correspondence on screen, including Susannah’s letter read in an earlier episode, and has used the letters as a connective tissue between characters when physical reunions were delayed. Whether the series will replicate the novels’ exact final sequence — the overseas stay in Spain, the specific content of the epilogue letters, and the seaside wedding ritual — will be answered when the Season 3 finale becomes available on Sept. 17.
Until then, readers of Han’s We’ll Always Have Summer can look to the trilogy for the author’s intended closure: a reconciled Belly and Conrad, whose marriage is framed by youthful longing, time apart and the small artifacts of love that keep people tethered across distance. The television show has adapted and altered those beats for the screen, but the novels remain the most direct account of the characters’ eventual domestic life.
The Summer I Turned Pretty Season 3 finale premieres Wednesday, Sept. 17, on Prime Video.