Summer’s heat is about to hit theaters like a tidal wave—leaked script pages from The Summer I Turned Pretty movie just spilled Belly’s ultimate endgame, but one Fisher brother’s shocking sacrifice could rewrite the love triangle forever. Jenny Han’s directing this bombshell, and fans are rioting: Conrad’s vow or Jeremiah’s vow? A hidden letter from Susannah changes it ALL. Click before the Cousins Beach secrets wash away. 🌊💔

The waves of Cousins Beach are crashing harder than ever, and they’re about to drown fans in a sea of spoilers. Just two months after Prime Video’s The Summer I Turned Pretty Season 3 finale left viewers gasping on September 17, 2025, leaked script excerpts from the upcoming feature film adaptation have surfaced online, promising to upend everything we thought we knew about Belly Conklin’s (Lola Tung) tangled romance with the Fisher brothers. Author and now-director Jenny Han, who penned the original YA trilogy, announced the movie at a lavish Paris premiere the same day as the finale—billed as the “proper due” for Belly’s “big milestone.” But these fresh leaks, shared via a now-deleted Reddit thread and dissected across TikTok, reveal a cinematic twist that diverges boldly from the books: A posthumous letter from Susannah Fisher (Kyra Sedgwick) that forces Belly to confront not just love, but legacy.

Han, speaking to Entertainment Weekly post-announcement, teased: “The series gave us three summers of heartbreak. The movie? It’s the eternal one—the choice that echoes forever.” Production kicked off quietly in Wilmington, North Carolina, this October, with Han at the helm alongside co-writer Sarah Kucserka. Prime Video, fresh off Season 3’s 70 million global viewers (a 65% jump from Season 2), greenlit the film as a theatrical/streaming hybrid—slated for limited big-screen runs before hitting Prime in summer 2027. But with leaks flooding forums—script pages stamped “DRAFT 2.1” showing Belly’s wedding eve meltdown—the internet’s ablaze. #BellysLetterLeak has topped X trends, with over 3 million posts debating: Does Conrad (Christopher Briney) get his book-fated HEA, or does Jeremiah (Gavin Casalegno) pull a redemption that flips the script? As production ramps, one thing’s clear: This isn’t a cash-grab sequel—it’s a gut-punch finale that could redefine YA romance.

The leaks stem from a Vancouver-based crew whistleblower (per Variety‘s anonymous sourcing), who snapped photos of highlighted dialogue during a table read. Han shut down Christmas 2025 rumors on TODAY, insisting, “Not this year—we’re still crafting the magic.” Yet fans, spotting “14s” (Conrad’s gate number, Belly’s sweatshirt) in the finale credits, speculate a December 14, 2026, drop. Either way, the script teases a runtime north of 120 minutes, blending beachy nostalgia with raw adult reckonings. Social media sleuths on Reddit’s r/TheSummerITurnedPrett have frame-by-frame breakdowns, one viral post racking 50,000 upvotes: “Susannah’s letter isn’t just words—it’s the detonator.” With Han’s directorial debut echoing her To All the Boys touch—lush sunsets, aching voiceovers—the film promises to heal (or reopen) wounds from three seasons of will-they-won’t-they agony.

The Leak That Broke the Beach: Susannah’s Letter and Belly’s Breaking Point

At the script’s core? A divergence that book purists are calling “genius betrayal.” Jenny Han’s trilogy—The Summer I Turned Pretty, It’s Not Summer Without You, and We’ll Always Have Summer—ends with Belly choosing a post-college Conrad, their wedding a quiet affirmation amid grief. Season 3, premiering July 16, 2025, with 11 episodes, mirrored this: Belly (Tung) and Conrad reunite in Paris, Jeremiah (Casalegno) bows out gracefully after his Season 2 proposal heartbreak. But the leaked pages flip the epilogue: Fast-forward five years to a Cousins Beach vow renewal, where Belly—now a successful event planner—receives Susannah’s sealed letter, penned pre-cancer diagnosis. “My darling girl,” it reads in the excerpt, “love isn’t the boy who makes your heart race—it’s the one who steadies your storm. Choose the legacy, not the longing.”

The bombshell? The letter’s addendum reveals Susannah’s secret: She orchestrated the brothers’ rivalry to test Belly’s resilience, a maternal meddle that shatters the fairy tale. Cue the leak’s money scene—Page 87: Belly, veil askew on the beach altar, confronts Conrad mid-vows: “Was any of it real, or were we just her puzzle?” Briney’s Conrad, per the dialogue, crumbles: “She wanted us strong—for you.” Enter Jeremiah, crashing the ceremony not as villain, but victor—handing over a locket with Susannah’s inscription: “The summer you turned pretty was the day you chose yourself.” Fans speculate a Jere endgame, with the script hinting at Belly’s whispered “I do” to him under fireworks. “It’s not about Team Con or Team Jere,” Han told Us Weekly pre-leak. “It’s Team Belly—her owning the narrative.” Tung, in a Glamour profile, gushed: “Directing Jenny? She’s giving Belly the closure the books whispered but the screen screams.”

Off-script, the chemistry crackles. Leaked BTS from Wilmington shows Tung and Casalegno rehearsing a rain-soaked reconciliation—echoing Season 1’s debut dance—while Briney posts cryptic beach sunsets captioned “Waves crash, but truths linger.” Han’s vision amps the stakes: Adult Belly grapples with motherhood fears (a post-book addition), tying into Susannah’s legacy as a single mom. “We’re aging up without losing the heart,” Kucserka shared with Deadline. TikTok edits mash the leak with Olivia Rodrigo’s “Happier,” amassing 10 million views, while #SusannahsSecret divides forums: 60% rooting for Conrad’s brooding depth, 40% championing Jere’s golden glow-up.

Casting Comebacks and Fresh Faces: Who’s Returning to Cousins?

The core trio’s locked: Tung’s Belly evolves from wide-eyed teen to world-weary woman, her bob haircut swapped for loose waves symbolizing surrender. Briney, post-The Sex Lives of College Girls, channels Conrad’s quiet intensity with added edge—leaks show him sporting a faint scar from a “post-proposal brawl.” Casalegno, fresh off The Perfect Pair, gets the hero glow: Script notes describe his Jeremiah as “sun-kissed and steadfast,” leading a therapy subplot that heals his Season 2 spiral. “Jere’s not the sidekick anymore,” Casalegno teased on The Tonight Show. “This is his redemption rodeo.”

Supporting stars shine brighter. Rachel Blanchard returns as Belly’s mom Laurel, her novelist arc intersecting with Belly’s planner life in a meta book tour clash. Jackie Chung’s Susannah? Flashbacks only, but leaks hint at a “hologram” voiceover via deepfake tech for ethereal cameos. Newbies stir the surf: Isabella Briggs (from Outer Banks) as Belly’s college bestie-turned-bridesmaid, injecting queer undertones absent in the books; Kristen Connolly (The Whispers) as Conrad’s med-school mentor, sparking jealousy flames; and Tanner Zagarino as a surfer interloper who tempts Belly pre-vows. Recurring faves like Sean Kaufman’s Steven (Belly’s brother) pop in for comic relief—a disastrous bachelor(ette) party gone viral—while Rain Spencer’s Taylor gets a grown-up glow-up, officiating with snarky vows. Sedgwick’s Susannah haunts via letter readings, her “final gift” a tearjerker that THR insiders call “Oscar bait.”

Han, directing for the first time since To All the Boys: Always and Forever, assembles a dream team: Cinematographer Jason Blume (This Is Us) for golden-hour gloss, composer Victor Bullain for swells of synth-surf score. Production’s eco-conscious—Cousins sets rebuilt with biodegradable sands—mirrors the story’s themes of enduring bonds amid change. Cast bonds? Tung’s Insta stories show group bonfires, Briney strumming guitar for “team therapy.”

Beyond the Leak: Subplots That Swell the Saga

The script sprawls beyond romance. Belly’s career crossroads—a failing planner biz—mirrors Han’s own publishing hustle, with leaked pages showing her pitching a “Cousins Memoir” that outs family skeletons. Conrad’s med residency unravels in a malpractice scare, forcing a Susannah-echoed choice: Duty or desire? Jeremiah, now a realtor flipping the Fisher beach house, uncovers hidden deeds tying back to Susannah’s meddling— a financial twist that could evict the legacy. Steven’s subplot? A whirlwind Vegas elopement with Skye (Elise McNamara, recurring), injecting millennial mess into the millennial nostalgia. Taylor’s arc shines: Post-breakup glow, she launches a podcast “Beachside Betrayals,” unwittingly airing the Fisher dirt.

Laurel’s quiet storm—romancing Cleveland (Alfred Molina, in talks for a cameo)—adds mature heat, while Belly’s half-sister Anika (Kyra Sedgwick’s real-life nod) debuts as a tween firecracker, quizzing: “Aunt Belly, why’d Mom say love’s a con?” Leaks tease montages: Flashback summers intercut with future Christmases, a full-circle nod to the finale’s holiday tease. “It’s the bookends we deserved,” Han said in Vogue. Critics’ early whispers? IndieWire: “Han’s lens turns YA into womanhood anthem.” Box office projections? $150 million domestic, rivaling Twilight‘s bite.

Fan Fallout and Han’s Horizons: End or Encore?

The leaks have polarized the fandom. #TeamConradWeeps trends with fanfic floods, decrying a Jere pivot as “betrayal,” while #JereRedemption rallies with edits to Sabrina Carpenter’s “Espresso.” Reddit’s megathread hit 100,000 comments, one user venting: “Susannah’s letter feels like cheating the triangle.” Han addressed the frenzy on GMA: “Leaks hurt, but the heart’s intact—Belly chooses growth.” No Season 4 confirmed—Season 3 was the trilogy cap—but Han’s “never say never” to EW hints at spin-offs: A Taylor-led podcast procedural? Steven’s Vegas misadventures? With XO, Kitty Season 3 locked for Netflix, Han’s empire swells.

As Wilmington wraps principal photography by spring 2026, the movie stands as The Summer I Turned Pretty‘s sun-kissed swan song—or is it? Leaks promise tears, triumphs, and a beachside “I do” that honors the hurt. Belly’s milestone? Not just marriage, but mastery—over loss, love, and the long shadow of summer.

Will the letter rewrite your ships? Sound off below—and brace for the tide. Stream Seasons 1-3 on Prime Video now.