Adapted from documentary literature " Please tell the director, three brigade task completed. " The rape and murder suspect died in the interrogation room after being beaten by the crowd. The three brigades in charge of the case were also sent to prison. The other suspect is still at large. After his release from prison, three brigade under the leadership of Captain Old Cheng to track down his whereabouts, and finally assist the police to capture the suspect, chasing the murderer for 12 years.