To Sir, with Love II (1996)

Mark Thackery, who after teaching in London for 30 years retires and decides to relocate to Chicago and accepts a job teaching at an inner city school. He finds several students whom he thinks have potential to do good if they stay on right path. But his tenure is in jeopardy when he catches a student with a gun which he confiscates and turns in. But when it's discovered that the gun was used in a crime and when the police demand that he tell them who had the gun and he refuses. He is also looking for someone.