Code 4 is an insider's view of the police profession as seen through the eyes of one of its veterans. Over a 37-year span Terry Smith worked as a uniformed officer, undercover narcotics agent, organized crime investigator and a homicide detective. He writes about things that happened while he was "protecting and serving" and gives an inside look at several newsworthy cases he supervised, including two tragic abduction homicides involving victims Julie Holmquist and Katie Poirier.