Two years later, 20-year-old Blake returns to Boston from Paris to find her boyfriend Isaac asleep in bed. She gets messages from Wyatt’s twin sister Gigi, apologizing but linking to a leaked sex tape of Isaac with a New England Patriots cheerleader.

A transcript from the family “Dad Chat”—a group including Blake’s father and his close college friends—shows the fathers debating how to respond to the scandal, eventually settling on “MTAC” (Make The Asshole Cry).

Six weeks after the breakup, Blake still hasn’t cried. Isaac’s affair with the cheerleader, Heather, had lasted a year. Blake is going to Lake Tahoe to spend the summer at the lake house her family co-owns with the Grahams. Her mother calls to encourage her to embrace self-discovery, and Blake confesses her anxiety about the future, having switched majors three times. Her mother declares it the “summer of Blake” (27). Blake arrives at the empty house and takes a beer to the dock. Hearing a noise, she panics, throws her beer can at a shadowy figure, and kicks him. She trips, and as the man tries to steady her, they both tumble into the freezing lake.

Wyatt surfaces in the cold lake. He and Blake argue about why they’re both at the house, then go inside to change. Wyatt reflects that Blake is the one person he’s been avoiding. On the advice of a former bandmate, he has been celibate for six months in hopes of curing his writer’s block. He remembers the Christmas Eve encounter with Blake and admits to himself he wanted her and wasn’t as drunk as he claimed.

Blake apologizes for hitting him with the beer can. They argue who has the best bedroom, and Blake bursts into sobs and blurts out that Isaac made a sex tape. Wyatt reveals he already knows from the family group chat. Blake takes the other room and declares they’ll set ground rules tomorrow. Wyatt reflects that he’s drawn to Blake but believes he would hurt her because he doesn’t commit to women.

Blake overhears Wyatt telling his father she needs to be “looked after.” Confronting him, she learns their fathers have ordered Wyatt to protect her. She also receives texts from Isaac arguing over a beloved sandwich maker of hers, which he refuses to return. She threatens to smash Wyatt’s guitar if he calls her “kid” again.

Blake decides to take the boat out. She and Wyatt agree to stay out of each other’s way but, citing his protective orders, he insists on coming in the boat.

On the boat, Blake removes her bikini top to sunbathe, flustering Wyatt, who orders her to cover up. He receives a nude photo from a former hookup and insults Blake’s body when she sees this, which hurts her. She threatens to remove her bottoms unless he gives her a beer; he complies.

Wyatt tries to write music but is blocked. Blake asks him to play guitar instead, and he improvises a melody. She tells him she envies his talent and feels she’s not good at anything. They discuss his refusal to use his mother’s musical connections. Blake gives him an unguarded smile that captivates him, inspiring a lyric about her smile stopping the world.

At dinner, Blake and Wyatt bicker playfully. Blake confesses she lost her virginity to Beau, one of the younger hockey kids in their social circle. She remembers that Wyatt never kissed her on the lips during their Christmas Eve encounter.

Blake announces she’s going to a bar; Wyatt forbids it. A boat arrives carrying two paranormal podcasters searching for the ghost of Darlie Gallagher, a woman who allegedly died by suicide in the lake years before. The podcasters, both called Spencer, had heard screams the previous night, and Blake realizes it was her when she fell in. After the men leave, Blake and Wyatt return to the house laughing. Using reverse psychology, she baits Wyatt into insisting he accompany her to the bar.

At a dive bar, Wyatt feels possessive watching Blake and accuses her of flirting with the waiter. He apologizes and confesses he’s had writer’s block for a year and has been celibate for six months to fix it. When a bartender touches Blake’s hair, Wyatt intervenes and insists they leave. In the parking lot, Blake asks if he was jealous; he denies it and tells her she’s just desperate for attention after the breakup. The ride home is silent.

After Blake goes to her room, Wyatt masturbates to a photo of her on Instagram, then goes to write on the dock when he can’t sleep.

Gigi calls Blake and reveals Wyatt has chronic insomnia that worsens when he’s being “a jerk,” advising Blake to tell him he hurt her feelings. Blake sees an online photo of Isaac holding hands with Heather at a party, which stings.

Blake discovers Wyatt has been secretly going to a local arena to play hockey, hiding it from his father. She insists on watching him and is mesmerized by his skill. Afterward, she confronts him about his insult through the plexiglass, telling him his words made her feel like she deserved to be cheated on. After a long silence, Wyatt says quietly that it won’t happen again.

Wyatt confesses the pressure of needing to succeed on his own terms, then accuses Blake of being a distraction and leaves. He returns late and very drunk, stumbling in the hallway and telling Blake she’s the reason his head stops working but that he’s not worth her time and the only thing he’s good for is sex. Blake is aroused but tells him she no longer fantasizes about him and leaves the room. She peeks back in to find him passed out, feeling compassion and recognizing he’s deliberately pushing her away.

Next morning, a sober, clean-shaven Wyatt apologizes, explaining his insomnia and that he sometimes drinks when he hasn’t slept for days. He promises to act like her friend. Over the following week, they settle into a comfortable routine. Blake researches Darlie Gallagher at the library and discovers she was real—engaged to a man from a wealthy local family—but finds no record of a drowning. At the grocery store, they run into a woman named Annaliese, who introduces her college friends and is invited to the lake house. They also encounter Rosie, a local girl Wyatt had previously hooked up with. He’s polite but cold, and she leaves hurt. Wyatt tells Blake he has to maintain firm boundaries, and Blake privately reflects it’s better that she and Wyatt never hooked up.

Wyatt’s manager reveals that producer Tobey Dodson wants to work with him. Assuming nepotism, Wyatt calls his mother angrily, but she clarifies that Tobey’s approach is independent. Wyatt feels excited but pressured, having no new material.

Annaliese and her friends visit the lake house. The group decides to jump off the boathouse roof. Wyatt teases Blake about her fear of heights and bets she won’t jump. She climbs to the roof but hesitates at the edge and retreats, claiming someone needs to judge from the water. She dives in from the pier instead.