Police officer Daniel Saxon (Charlie Sheen) goes undercover in an effort to topple a motorcycle gang whose members deal in illegal weapons and drugs. To prove himself to the gang's leader, a thug called "Blood" (Michael Madsen), Saxon engages in a series of dangerous acts. Though he takes solace in his burgeoning romance with Renee (Linda Fiorentino), a photographer chronicling the gang's lifestyle, Saxon finds the line between police work and criminal behavior increasingly blurry.