The novel opens with an unnamed narrator falling through the air toward a hard wooden floor. The fall feels strangely calm, giving the narrator time to think about parents, about not wanting to die, and about the possibility that never playing basketball again "might not be the worst thing in the world" (1). The narrator hits the floor, and everything goes dark. A title card reads "First Half: Four Months Earlier."
The story is set in Walthorne, a basketball-obsessed town where a rivalry divides two middle schools: the Walthorne North Cougars and the Walthorne South Panthers. Alfie Jenks, a middle school sports reporter for South's radio station and online blog, introduces the key players. Austin Chambers, 14, captains North as a point guard. His father, Frank Chambers, is a local legend and former Penn State shooting guard. Carter Haswell, 14, captains South. An all-state player already six feet two, Carter is coached by Benny Walters, a legendary former high school coach who came out of retirement to lead South's program. Told through blog posts, radio transcripts, text messages, social media threads, and first-person narration, the novel follows Austin, Carter, and Alfie through a season in which the pressure to win pushes everyone past the breaking point.
When an online pep rally on the site Walthornespirit.com devolves into trash talk and classist insults, it exposes a sharp divide: North is overwhelmingly white and wealthy, while South is diverse but underfunded. The season opener, broadcast by Alfie, is a thriller. Carter leads South with 18 points, but North's center, Clay Elkind, contributes 13 points despite a visible limp. On the final play, Clay blocks Carter's layup to seal North's 52-51 win, then collapses in agony. Postgame scenes reveal contrasting home lives: Carter's mother works double shifts and tells him his talent could earn a college scholarship, while Austin's father critiques his performance and notes that Clay's injury means Austin will get more touches.
Alfie investigates Clay's injury. Clay admits he entered the game hurt but insists he chose to play. Alfie publishes a blog post speculating that a coach or parent pressured Clay, sparking uproar. The debate escalates until Austin posts a public confession: He pressured Clay all week to play through the injury and argued with him at halftime when Clay wanted to sit out. Alfie is devastated, realizing she guessed the truth rather than verifying it. When Austin visits Clay to apologize, Clay suggests some people suspect Austin wanted him injured to reclaim the spotlight. Austin storms out.
Austin's private coach, Mr. Cashen ("Coach Cash"), a college teammate of Frank, launches an invitation-only AAU (Amateur Athletic Union) program called Slam Academy. At practice, Coach Cash conspicuously favors Austin because Austin's father sponsors the team, and teammates mock the preferential treatment. Carter dominates the scrimmage. Austin's father reveals he is arranging a scholarship for Carter, whose family cannot afford the fee.
Back at school, Coach Benny warns Carter that failing math means disqualification from basketball. The pressure mounts when Carter's father, a housepainter, loses his job after a homeowner blames him for chipping a valuable eagle sculpture. Carter's father has a drinking problem Carter has long noticed but never confronted. With his father unemployed and Coach Benny's directive to do whatever it takes ringing in his ears, Carter cheats on his math test by copying from his friend Eddy's paper. Alfie, sitting nearby, notices. After the exam, Alfie goes to their teacher Ms. Vallone's classroom but cannot bring herself to speak. Before she can decide, Carter walks in, sees Alfie, and confesses everything. Carter assumes Alfie reported him.
Carter is suspended for three days and indefinitely from the team. Coach Benny resigns, acknowledging his words may have encouraged the cheating. Carter's friends brand Alfie a snitch, and she is ostracized for months. She writes a blog post questioning whether youth sports have spun out of control, citing Clay's injury, an enrollment fraud involving a North player named Sophia Vargelle, and the cheating scandal.
Three months pass. Both teams decline without their stars, each finishing 9-10; the final game will determine the last playoff spot. Clay is cleared to play and reconnects with Austin at Tompkins Park. Austin realizes the kid with glasses he played against at Free Shoot, a Saturday open-play session four summers earlier, was Carter. A flashback reveals the two were co-captains every week, settling disputed calls with rock paper scissors.
Carter is reinstated after a meeting with Principal Marshak, his parents, and school staff. Ms. Vallone confirms directly to Carter that Alfie never reported him. At AAU practice, Austin reaches a turning point: When Coach Cash calls a phantom foul to award Austin free throws, Austin refuses to shoot, declaring that his teammate Alonzo, a more talented Slam Academy player, should start over him. Austin hands Alonzo the ball; Alonzo waits for Coach Cash's approval before re-entering. Austin's teammates respond with newfound respect.
Austin invites Carter to his house, where they bond on the court. Then Carter stops in front of a sculpture of an eagle with a chipped wing. Austin mentions a worker dropped it. Carter realizes the worker was his father and tells Austin the full story. Austin blurts out that Carter's father was drinking on the job. Devastated, Carter declares their friendship impossible and leaves.
At Thursday's girls game, tensions explode. Chase Crawford, a friend of the North players, shouts a racist and classist remark at Janeece Renfro, South's girls team captain, after she fouls out on a controversial call. Carter climbs over students to confront Chase. A brawl breaks out, and the surging crowd pushes Carter toward a low railing at the bleachers' edge. Austin fights toward him but trips into Clay, who falls into Carter. Carter goes over the railing, connecting to the opening scene.
The boys game is canceled. In the "Overtime" section, Carter reveals his injuries: a concussion, broken ribs, and torn ankle ligaments, though doctors project a full recovery. Coach Benny visits the hospital and admits part of him may have wanted Carter to cheat. Alfie creates a thread on Walthornespirit.com asking for supportive messages. Students from both schools apologize, Janeece publicly asks Alfie's forgiveness for not believing her sooner, and the community adopts the hashtag #teammates.
Austin visits Carter's apartment. Carter's father reveals that Austin's mother called his boss and admitted she may have misjudged the sculpture incident, leading to his rehiring. Austin describes realizing he can love basketball without it consuming him. Carter reveals that being exceptionally talented sometimes made him wish he were worse, because the pressure to build his life around the sport overwhelmed him. Carter notes that Austin's AAU spot, secured through his father's money over more deserving players, was its own form of cheating. Austin falls silent. Carter proposes an idea.
In the "Double Overtime" section, set three months later, the canceled game is rescheduled by the kids themselves as a pickup game at Tompkins Park with no referees, no audience, and no adults. Austin's father drops him off and simply says to have fun. Carter names his South teammate Amir captain instead of himself; Austin does not start himself either. When a disputed call threatens to reignite tensions, Carter proposes settling it the way they did at Free Shoot: rock paper scissors. South wins by two. Afterward, alone on the court, Austin challenges Carter to one-on-one. Carter leads 21-20, but Austin launches a three-pointer. The novel ends with the ball in the air, both boys knowing there is no place they would rather be and that "no matter who wins, we're gonna go get ice cream" (308).