11.   He interviews streetwalkers, undercover cops, porn-movie producers, former Los Angeles Police Department chief Daryl Gates and, eventually, Fleiss herself.

12.   He was driving a rental car, alone, when he encountered a woman who turned out to be an undercover cop.

13.   His brother, Frank Jr., an undercover cop and Bronx detective, worked on cases that inspired books and television shows.

14.   How about sending undercover cops into Roxbury, Mattapan, and Dorchester to pose as cabdrivers?

15.   How often does a spouse in search of a hit man make a deal with the real article instead of an undercover cop?

16.   In Arlington and Plano, undercover cops keep an eye on high-crime venues.

17.   In suburban Arlington and Plano, undercover cops keep an eye on high-crime venues.

18.   Instead, on his first day at work, he rolls up on a crime scene where six people are dead, including an undercover cop.

19.   It makes as much sense as a famous undercover cop.

20.   Johnson was a sensation as sexy undercover cop Sonny Crockett.