Gabe Steele, a Hollywood mystery writer fallen victim to age discrimination, takes a job as manager of the theft-plagued Beverly- West Racquet Club--only to see on his first day two more locker-room robberies and a murder (retarded attendant Danny White, whom he'd deputized to keep an eye on the members). Prominent suspects among the corrupt, libidinous members include the club president, Jock Kornfeld; new members Aaron Wexler and his hubba-hubba wife Jan; Kim Randall, producer of exploitation films who lends his nearby apartment out for heavy social affairs; and Rick Reeves, a washed-up former junior tennis champ chafing under his tightwad father's thumb and his former doubles partner's meteoric rise. Helped out by his girl Friday Jenny Ho, Gabe follows a connect-the-dots trail to the obvious killer. First-novelist Marx (The Nine Lives of Mickey Rooney, 1986, etc.) keeps his story moving briskly, but except for the torrid sex with willing Jenny, it's all quaintly dated. You can see why Gabe was put out to pasture.