Ye Chong gives a list of Communists who need to leave before being captured to Xiao Zhuang who gives it to Tang Feng. The Japanese go on Communist raids. Some people have escaped and it proves that someone on the Japanese side is helping them. Ye Chong knows he is now being highly suspected. Ye Chong tries to find the missing Professor Yu and gets the herbs from the medicine. Xiao Zhuang uses the telephone to get them to check out the herbs from the medicine. They track down the herbs to a doctor and get his help to capture Dr. Wu. BIS also wants to save Professor Yu.