Ep 27. Rookie

When one of Walker's proteges joins the Police force, Walker decides to send the green young cop undercover. Having had a close personal friendship as kids with a man very important to Walker's investigation, Walker feels the rookie is the best man for the job. He does quite well, however some of the plans don't go as intended. Faced with taking down a good friend, Walker must count on the rookie to come through and remember why he wears the badge.