Dr. Mark Sloan is chief of Internal Medicine at Community General Hospital -- and sometime consultant to the local police department. When he's drawn into a case, he combines sleuthing and medicine to solve the crime. That crime is usually one his detective son, Steve, is working on as a member of the local police department. Dr. Sloan's medical colleagues, including doctors Amanda Bentley, Jack Stewart and Jesse Travis, are also frequently drawn into his investigations.
Crime in school is bad, so to combat it, LAPD higher-ups decide to send four young-looking officers to high school to pose as students. Cops Tom Hanson, Doug Penhall, Judy Hoffs and Harry Truman Ioki are the "lucky" ones chosen to experience the part of their lives they hoped they'd left behind forever.