Dante Quintana offers to teach Ari how to swim at the public pool, and the two boys quickly become friends.

Boys shoot a bird with a BB gun; Dante cries over the dead bird and Ari steps in to defend him.

Dante gives Ari's father an art book of Mexican paintings, and Ari's father receives it with surprising tenderness.

Dante announces his family is moving to Chicago; moments later, a car swerves around a corner directly toward him and Ari.

Ari wakes in the hospital with both legs in casts, and Dante tells him he saved his life.

Dante gives Ari his personal sketchbook as a gift; Ari throws it across the room without opening it.

Before leaving for Chicago, Dante tells Ari that he loves him.

Ari's parents give him a cherry-red pickup truck as his sixteenth birthday gift.

Dante writes in a letter to Ari that he has been kissing girls but would rather be kissing boys.

Dante returns from Chicago after nearly a year away, and he and Ari establish two new rules for their friendship.

Dante persuades Ari to kiss him, but Ari doesn't like it and feels angry with Dante afterward.

Ari returns home to learn that Dante was beaten by a group of boys who saw him kissing another boy in an alley.

Ari tracks down Julian Enriquez, one of Dante's attackers, and beats him up, breaking his nose.

Ari's mother opens a long-sealed envelope and tells Ari that Bernardo was imprisoned for murdering a transgender sex worker.

Ari drives Dante to his favorite spot in the desert, confesses he is afraid of him, and they kiss again.

Aristotle Mendoza meets Dante Quintana at a public pool one summer and the two boys form an intense and unlikely friendship. Their bond deepens until Ari risks his life to push Dante out of the path of an oncoming car, breaking his own legs in the process. After Dante moves to Chicago, the boys stay in contact through letters, and Dante gradually reveals that he is attracted to men. When Dante returns the following summer and is brutally beaten for kissing another boy, Ari's fierce protectiveness forces him to recognize the depth of his own feelings. With his parents' acceptance and encouragement, Ari finally overcomes his shame and confesses his love to Dante in the desert.

The core friendship and love story between Aristotle and Dante.

Ari's mother asks him to volunteer at the food bank; he refuses to change out of his Carlos Santana t-shirt.

Ari discovers for the first time that his father studied art before joining the Marines.

Dante's parents take the boys to the desert at night to stargaze through Dante's new telescope.

Ari comes down with a high fever and dreams of millions of sparrows falling from the sky and covering him in blood.

Ari tells Dante about his older brother Bernardo being in prison — the first time he has told anyone.

Ari's mother tells him she always wanted to be a teacher, and Ari sees her as a full person for the first time.

Ari searches newspaper microfilms at the public library looking for his brother Bernardo's name.

A stray dog follows Ari home and his father lets him keep her; Ari names her Legs.

Charlie Escobedo asks Ari to do heroin; Ari kicks him out of the house and then gets drunk alone.

Ari kisses Ileana at a party and afterward realizes he actually had a good time.

Ileana drops out of school after getting pregnant and marrying her boyfriend, who is in a gang.

Ari and Dante smoke marijuana together in the desert for the first time and run around naked in the rain.

Aunt Ophelia dies and the Mendoza family travels to Tucson for her well-attended funeral.

Ari's mother reveals that Aunt Ophelia spent her life in a romantic relationship with a woman named Franny.

Dante lies badly injured in the hospital and Mrs. Quintana tells Ari she believes Dante is in love with him.

Before Ari and Dante's friendship transforms both boys, Ari is a lonely teenager surrounded by family silences he cannot break. He gradually uncovers fragments of his parents' inner lives — his father's artistic past and his mother's buried dreams — while carrying the weight of his imprisoned brother Bernardo's absence. While Dante is away in Chicago, Ari distracts himself with a stray dog, a crush on a girl named Ileana, and the occasional reckless choice. The two friends reunite for one last summer and share a moment of wild freedom before the family's hidden histories finally begin to surface. When Dante ends up beaten and hospitalized, Mrs. Quintana tells Ari the truth she has suspected all along: Dante is in love with him.

The hidden lives of family and the secrets buried beneath the surface.

Dante invents a shoe-throwing game and insists to Ari that the rules they create for it are genuinely real.

Ari's father rocks him to sleep during a high fever and afterward admits to Ari that he also suffers from bad dreams.

Dante draws Ari while he recovers from the flu but refuses to let Ari see the sketch.

Ari's surgeon calls him a very rare young man, and Dante's father tells Ari that Dante does not want to leave for Chicago.

Ari's mother urges him to stop keeping things bottled up; Ari fires back that she should talk about Bernardo first.

Ari slips a note into Ileana's locker, and Gina warns him that Ileana is trouble.

Ari writes his first letter to Dante, telling him about taking a driving lesson with his father.

Ari finds a sealed envelope with Bernardo's name on it but decides to wait for his mother to tell him the truth.

Dante writes to Ari that a girl he was kissing stopped and asked if he was thinking about kissing a boy.

Dante's mother announces she is pregnant; Dante confides to Ari that he is afraid to tell his parents he is gay.

Ari's father tells him on the drive to Tucson that when Bernardo was on trial, Ari's mother completely fell apart.

Ari confronts Daniel in an alley and forces him to give up the names of the boys who beat up Dante.

Mr. Mendoza threatens to sell Ari's truck; Ari tells his parents that Julian beat up Dante for kissing another boy.

Ari's father tearfully confesses he left a soldier named Louie behind in Vietnam, then tells Ari to stop running from his love for Dante.

Ari apologizes to Dante after their fight about Daniel, and their two families go bowling together.

Throughout the novel, small and large turning points reshape Ari's understanding of himself, his family, and Dante. Early moments — Dante refusing to show his sketch, Ari's father quietly admitting to bad dreams — hint at the emotional depths both boys are hiding from one another. As Dante pushes Ari toward vulnerability through letters and small acts of courage, Ari begins investigating the secret of his brother's imprisonment on his own. By the time Dante returns from Chicago, Ari is slowly becoming the version of himself that was always waiting beneath the silence. After Dante is attacked and the Mendoza family holds a long-overdue reckoning with their buried pain, Ari's father breaks down about Vietnam and gives his son permission to love without shame.