Cousins Beach Will Never Be the Same: The Summer I Turned Pretty Season 4 Brings Back Old Faces, New Heartbreak, and One Final Summer That Changes Everything

When The Summer I Turned Pretty Season 3 ended on September 17, 2025, fans thought they’d bid farewell to the sun-soaked shores of Cousins Beach. Belly Conklin (Lola Tung) and Conrad Fisher (Christopher Briney) sealed their epic romance with a Parisian reunion, their love crystallized in a montage of Christmas lights and beachside promises. Jeremiah (Gavin Casalegno), heartbroken but hopeful, found solace with new flame Denise (Isabella Briggs) and a mended bond with his father, Adam. Jenny Han’s handwritten note in the finale—“Maybe we’ll meet again one summer in Cousins”—felt like a tender goodbye. But on September 29, 2025, Han flipped the script, announcing to Entertainment Weekly that a feature-length movie, effectively Season 4, is set for a 2027 Prime Video release. Titled One Last Summer, it promises to bring back familiar faces, unleash fresh heartbreak, and deliver a final chapter that will leave Cousins Beach forever changed.

The Season 3 finale, “At Last,” tied up the trilogy’s threads with a bow that felt both satisfying and fragile. After calling off her wedding to Jeremiah amid his infidelity reveal—a softened take on the books’ spring break betrayal—Belly jetted to Paris for a semester abroad, embracing independence. Conrad’s “serendipitous” stopover en route to a conference sparked a day of fervent kisses and confessions, culminating in a flash-forward to their blissful holiday in Cousins. No ring yet, but the vibe screamed endgame, backed by 20,000 X posts celebrating “ConBelly forever.” Jeremiah, meanwhile, began anew with Denise, a sharp chef from Steven’s startup circle, their beach kiss a flicker of hope. Yet, Han’s cryptic tease—“This summer tests every bond, old and new”—hints that the movie will unravel this harmony, reintroducing old characters, igniting new conflicts, and reshaping the beach house’s legacy.

The movie, set two years post-finale, catches Belly and Conrad on the cusp of engagement, planning a quiet wedding at Cousins. But the return of “old faces” shakes the foundation. Per Variety, Susannah’s sister, Julia (Kyra Sedgwick in a dual role), reappears after Season 2’s house sale drama, now wielding influence over the beach house’s future. Her presence stirs unresolved grief, especially for Conrad, whose therapy progress is tested by memories of his mother. Laurel (Jackie Chung), Belly’s mom, returns with a new partner—a shock teased in Reddit leaks with 5,000 upvotes—complicating her role as the family’s anchor. Steven (Sean Kaufman) and Taylor (Rain Spencer), now navigating their own careers, face tensions as Steven’s startup falters, pulling him into the wedding’s orbit. Even Cam (David Iacono), Belly’s Season 1 fling, might cameo, per X buzz with 3,000 likes, as a marine biologist tied to a Cousins conservation project. These familiar faces, once background players, now amplify the stakes, their ties to Belly and the Fishers fraying under pressure.

New heartbreak looms large. Han told Vulture, “This isn’t just about love—it’s about what Cousins means when you’re no longer kids.” Conrad, now a med school grad, grapples with career stress and a secret that could derail his engagement: a rumored near-miss with a colleague, confessed in therapy but hidden from Belly, per a leaked script snippet shared on X with 10,000 engagements. “I did it to protect us,” he pleads in the unconfirmed dialogue, but the lie threatens to echo his past self-sabotage. Jeremiah, thriving as a Boston chef with Denise, isn’t immune. Vanity Fair reports suggest he’s drawn back to Cousins for the wedding, only to confront lingering feelings when he sees Belly in her mother’s old dress. Denise, no mere rebound, challenges his motives, her own arc—hinted at in Briggs’ Collider interview—adding a secondary triangle that could fracture the Fisher brothers’ truce. “Jeremiah’s not chasing Belly,” Briggs teased. “But he’s chasing closure, and that’s messier.”

The love triangle’s revival is the movie’s pulse. Season 3’s 25 million global viewers and 30,000 X posts on finale night prove the fandom’s obsession with Belly’s choice. Conrad’s Season 3 redemption—therapy, vulnerability, Paris—won hearts, but his secrecy risks alienating fans, with @teamconrad4eva’s 2,000-like post warning, “If he lies to Belly, it’s Season 2 all over again.” Team Jeremiah, fueled by Casalegno’s “revenge era” comments in Teen Vogue, sees opportunity: “Jere’s grown, but one look at Belly and he’s fighting,” reads a thread with 7,000 replies. The movie’s twist, per Refinery29, might hinge on a Cousins Beach fundraiser to save the house, where both brothers vie for Belly’s trust—Conrad through grand gestures, Jeremiah through quiet loyalty. A viral X clip of their Season 3 fight, with 15,000 likes, fuels speculation: will a new brawl, perhaps over Julia’s estate plans, force Belly to redefine “forever”?

Cousins itself is the heartbeat. The beach house, a character in its own right, faces a real-world threat: developers eyeing the coastline, per a Deadline rumor. This external pressure mirrors the internal collapse, as old traditions—bonfires, volleyball games, Susannah’s Fourth of July party—take on desperate urgency. Marie Claire noted Season 3’s “nostalgia-soaked visuals” drove its 10 million streaming hours, and the movie leans harder, with Wilmington’s beaches set for a 2026 shoot. Han’s Instagram, flooded with 6,000 comments begging for “one last summer,” reflects fans’ attachment to the setting. Yet, posts like @cousinsvibes’—with 4,000 likes—fear “turning the house into a battleground ruins its magic.”

The new faces add fuel. Denise, introduced in Season 3, emerges as a wildcard, her ambition clashing with Jeremiah’s unresolved past. A new character, teased as a “Cousins local” in The Wrap, might be a developer’s son, sparking tension with Belly over the town’s future. These additions risk overcrowding, but Han’s To All the Boys sequels proved she can balance sprawling casts. BBC’s Season 3 review, with 8 million views, praised her “knack for making every heartbreak feel personal,” and the movie’s rumored Swift-heavy soundtrack—think “August” reprised for a gut-punch scene—will amplify the ache.

The final summer changes everything because it forces a reckoning. Belly, now 21, isn’t the girl who “turned pretty”; she’s a woman whose independence, forged in Paris, faces its ultimate test. Will she cling to Conrad despite his deception, or find strength in letting go? Can Jeremiah move forward, or will Cousins pull him back? Steven and Taylor’s arcs—potentially a breakup, per Reddit’s 3,000-upvote theories—mirror the broader unraveling. Even Laurel, grappling with her own past, might push Belly toward a choice that echoes Susannah’s: love fiercely, but know when to walk away. Vulture predicts “a finale that burns the beach house down metaphorically, maybe literally,” with 12,000 X engagements debating if the house survives.

The numbers scream hype: Season 3’s 25 million viewers, 40,000 X posts post-finale, and Han’s 10,000-comment Instagram Q&A fuel anticipation. Tung told EW, “Belly’s ready for the end, but it’s not what you expect.” Briney added, “Conrad’s fighting for home, not just love.” Casalegno, ever the optimist, teased, “Jeremiah’s got one last card to play.” Whether it’s a wedding, a breakup, or a town-saving rally, this summer will rewrite Cousins’ legacy. The tide’s pulling out, old faces are back, and heartbreak’s inevitable—but in Han’s hands, it’s the kind of pain that feels like home.