A small, seemingly innocuous plastic reel of film leads surveillance specialist Tom Welles down an increasingly dark and frightening path. With the help of the streetwise Max, he relentlessly follows a bizarre trail of evidence to determine the fate of a complete stranger. As his work turns into obsession, he drifts farther and farther away from his wife, family and simple life as a small-town PI.

Set in 1977, back when sex was safe, pleasure was a business and business was booming, idealistic porn producer Jack Horner aspires to elevate his craft to an art form. Horner discovers Eddie Adams, a hot young talent working as a busboy in a nightclub, and welcomes him into the extended family of movie-makers, misfits and hangers-on that are always around. Adams' rise from nobody to a celebrity adult entertainer is meteoric, and soon the whole world seems to know his porn alter ego, "Dirk Diggler". Now, when disco and drugs are in vogue, fashion is in flux and the party never seems to stop, Adams' dreams of turning sex into stardom are about to collide with cold, hard reality.