The Crime Train

During the Spring Festival travel period, auxiliary police officer Zhang Wenduo received a message from a kidnapper on the train home and learned that his mother had been kidnapped. The kidnapper asked Zhang Wenduo to kill the suspect who was escorted by the police on the train before the train arrived at the terminal, and threatened Zhang Wenduo not to call the police. If she calls the police or fails to kill the suspect, Zhang's mother will die. Zhang Wenduo judged that this was a "game" and the kidnapper's purpose was not as simple as letting him kill the suspect. In order to save his mother, Zhang Wenduo decided to join in the game even though he knew it was a "game". Can the situation be broken, can the mother be rescued, and can the real culprit be found out? - Please read!