Still on her bike, Kami reaches the Yellow Bridge just as the storm worsens. The bridge triggers a memory of the birthday party where everything unraveled. In flashback, Kami recalls that the night before the party she told Roger everything she had witnessed—the affair, the tree house, Thiago’s demand for silence—because she was afraid her mother would take her away if they divorced. She now understands Roger received the news calmly because he intended to catch the two together himself.

In the present, rain is coming down hard. Kami has no lights on her bike and no phone, and she begins pedaling for home through the dark.

The flashback continues: At Lucy Di Bianco’s fourth birthday party, Anne and Travis disappeared before the cake was cut, and Roger went inside looking for them. Shouting erupted from the house, and then Roger and a shirtless Travis burst outside, fighting. Thiago, though still a child, threw himself between the two men and tried to stop the fight. The brawl destroyed the party, and someone called the police. Officers took Roger away. Katia Di Bianco stood frozen until the chaos overtook her; she then gathered Thiago, Taylor, and a sobbing Lucy and drove off. Kami reflects that everything fell apart after that party.

The narrative shifts to Thiago Di Bianco’s perspective on the same Thursday. He is struggling with growing feelings for Kami and jealousy over her closeness with Taylor. At home, their mother, Katia, is locked inside Lucy’s old bedroom, and Taylor is escaping into video games. Unable to bear the weight of the day, Thiago gets in his car and drives into the storm, drawn toward the Yellow Bridge.

The drive pulls him into a flashback: After the party, Katia drove in a state of collapse—crying, speeding, telling Taylor his father was cheating on her with her best friend. Near the bridge, driving at 90 miles per hour, a deer crossed the road. The car struck the bridge’s railing and plunged into the lake. Katia was knocked unconscious. Water poured in. Thiago directed Taylor to retrieve a tire iron from the trunk, then smashed a window and dragged his unconscious mother out. He surfaced, then dove again, finding Taylor unable to free four-year-old Lucy from a jammed seatbelt. He pulled a paralyzed Taylor free, intending to return for Lucy, but ran out of air and was forced to surface. Katia, now conscious, dove alongside him on the next attempt. Together they finally freed Lucy’s body and brought her up. On the shore, a bystander performed CPR for 20 minutes without success. As paramedics continue their efforts, Thiago sees his father arrive at the scene while Katia remains consumed by grief. The paramedics cut open Lucy’s Cinderella costume in their efforts, and that is the image that finally broke Thiago. Taylor took his hand, and the two brothers ran from the scene.

Back in the present, Thiago spots Kami stranded in the rain near the same bridge. He pulls her into his car and drives until he can park. Kami asks if he will ever be able to forgive her. Thiago recalls Lucy’s funeral, where he confronted a 10-year-old Kami, told her Lucy’s death was her fault, and shoved her to the ground. Taylor immediately defended Kami and told Thiago the fault was his own for not getting Lucy out in time. That accusation has haunted Thiago ever since, because he knew it was true.

Now, sitting in the car with Kami, Thiago asks her forgiveness instead. He admits he blamed her because it was easier than blaming himself. Kami tells him it was no single person’s fault and urges him to stop punishing himself and live fully for Lucy’s sake. Thiago catches one of her tears and feels, for the first time in years, a reason to go on. He asks whether she ever cared for him more than for Taylor. Kami says it has always been him. Thiago kisses her.

The kiss releases years of buried feeling on both sides. Through tears, Kami begs him never to leave her again. He tells her she has been his since they were children. The moment breaks when Kami whispers Taylor’s name.

Thiago acknowledges that Taylor has always had strong feelings for Kami and admits his own jealousy drove much of his behavior since returning to Carsville. He then states plainly that a relationship between them is impossible. Kami privately agrees, reflecting that Thiago works at the school as a coach, that a relationship would violate the rules, that her mother would make her life unbearable if she found out, and that she and Thiago have always been fundamentally different. Thiago frames what happened as an olive branch—the peace they should have made years ago—and helps her back to the passenger seat.

Kami asks whether he has truly forgiven her. He says he will try, but his phrasing—that it was not entirely her fault—reopens her wound rather than closing it. She explains that she told Roger about the affair because Anne had threatened that Roger would never see her again, and a terrified 10-year-old had believed her. Thiago listens but then says coldly that he hates both Anne and his own father and wishes them dead. The statement shakes Kami. She asks to go home.

When they arrive, Thiago notices Cameron visible through the living-room window. Kami tells him Cameron is not his half-brother—Roger required Anne to take a paternity test, and Cameron is his son. Thiago asks about the bike; Kami says Roger is bankrupt and had to sell her car, and calls it karma. She turns away before Thiago can see how much the admission costs her.

The perspective shifts to Taylor Di Bianco, who watches Kami step out of Thiago’s car from his window and feels powerless. He recognizes his feelings for Kami but cannot ignore the way she and Thiago seek each other out. Noticing that Thiago avoids his eyes, Taylor suspects something has happened between them. He reflects that since Lucy’s death he has tried to be the person who moves forward—the high-achieving, agreeable son—and he is tired of feeling guilty for being the one who managed to find happiness.

Taylor confronts Thiago downstairs, then tells him Katia is in Lucy’s room. Both brothers go in.

The room is exactly as Lucy left it eight years earlier: her toys and a miniature tea service laid out on a low table as though guests were still expected. Katia is on the floor holding Lucy’s old pajamas. Taylor and Thiago sit with her. Thiago, gently but firmly, reminds their mother of the agreement they made before returning to Carsville—that they would truly start over. Katia says she knows, stands, and wipes her face. She tells her sons they are what matter most to her and agrees to donate Lucy’s belongings the next day. She asks only for one more day to grieve, noting that today would have been Lucy’s twelfth birthday.

Taylor kisses his mother’s forehead and walks out with Thiago. On the way, he quietly picks up a small porcelain teacup that Lucy had painted with his name, keeping it for himself.

The following week, the Di Bianco family packs up all of Lucy’s belongings and donates them to a local church. They then visit her grave at the Carsville cemetery, leaving a bouquet of flowers. Thiago places a lollipop against the headstone and quietly addresses his sister, pretending to warn her not to eat it before dinner—a running joke from when she was alive.

Thiago decides he needs a few days away from Carsville to think. Before leaving, he watches from his car as Kami walks over to be with Taylor. He pulls out the crumpled portrait she drew in detention, smoothed since he took it. It shows the four of them as children—Taylor, Lucy, Kami, and himself—at a moment when he was trying to catch Kami’s eye. He tells himself he must forget her.

As he drives away, Kami glances toward his car; Taylor does not. Thiago considers telling her to wait for him, that they could be together the following year. He decides against it. Taylor deserves her. Thiago concludes he has nothing good to offer and can no longer sustain the fight. He drives away.