Based on an original screenplay by Lincoln C. Hilburn, the series revolves around Sgt. "Pepper" Anderson (Dickinson), an undercover police officer working for the Criminal Conspiracy Unit of the Los Angeles Police Department. Sergeant William "Bill" Crowley (Earl Holliman) was her immediate superior, and Pete Royster (Charles Dierkop) and Joe Styles (Ed Bernard) were the other half of the undercover team that investigated everything from murders to rape and drug crimes. In many episodes, Pepper went undercover (as a prostitute, nurse, teacher, flight attendant, prison inmate, dancer, waitress, etc.) to get close enough to the suspects to gain valuable information that would lead to their arrest.