【内容提要】退休老工人程海看到一个小学生嘴上叼着香烟，他通过仔细观察，发现是一个戴旧便帽的人在引诱这个学生。于是，他依靠厂的党组织，跟学校的卓老师密切配合，终于把腐蚀青少年的那个戴旧便帽的坏家伙揪了出来。而这个坏家伙正是解放前迫害程海一家的国民党特务分子。故事告诉我们，千万不要忘记阶级和阶级斗争。

Abstract: Cheng Hai, a retired old worker, saw a pupil with a cigarette in his mouth. After careful observation, he discovered a man wearing a shabby cap who was luring the pupil. Thus, relying on the factory’s Party organization and cooperating closely with Teacher Zhuo, they finally caught the bad guy with the shabby cap who was corrupting a youth. This bad guy turned out to be a Guomindang spy who had destroyed Cheng Hai’s family before the liberation of China. The story alerts us to never forget class differences and remain vigilant about class struggle.