Gil Renard is a struggling knife salesman with a deep obsession for baseball, particularly his favorite team, the San Francisco Giants. His personal life is in shambles as he grapples with a failing marriage and strained relationship with his son. When Bobby Rayburn, a superstar player, joins the Giants, Gil's admiration for Bobby grows to a dangerous level. As Bobby struggles through a hitting slump, Gil’s fascination spirals into an unhealthy fixation that begins to disrupt his work and home life. Desperate for Bobby’s return to glory, Gil takes increasing liberties in his attempts to support him, blurring the lines between fanaticism and reality. His obsession reveals itself in unnerving behaviors, causing those around him to worry about his state of mind.

Amid this turmoil, tensions flare within the Giants, notably between Bobby and his teammate Juan Primo, leading to pressure on Bobby to reclaim his spot as the team’s star. Gil's frustrations mount as his life continues on a downward trajectory, and he becomes determined to be recognized by his idol. The boundaries between fan and player are crossed as Gil employs extreme measures in his single-minded quest. Through a series of increasingly erratic actions, the once harmless devotion transforms into a precarious situation that blurs the distinction between loyalty and menace, ultimately threatening both his and Bobby's worlds. As events unfold, Gil's behavior crescendos into chaos, setting the stage for an intense confrontation between admiration gone awry and the stakes of personal downfall.