While investigating a terrible murder, Detective Kelly realized that the infamous killer "Jigsaw" had begun his frightening killing game again. But this time he got worse, locked eight strangers who didn't know each other in one room, and forced them to kill each other.
After police detective Eric Matthew had an argument with his young rebellious son Daniel, the police department called him to investigate the murder scene designed by Jigsaw Murderer because his name was written on the wall. The victim was caught in a deadly iron mask and died. The mask was marked with the logo of Wilson Steel. Matthew summoned SWAT to the company’s abandoned factory, which was another jigsaw murderer. Hiding place. There is a control room with multiple computers. The screen shows that many victims are trapped in a room full of poisonous gas, and one of the victims is his son Daniel. There is a timer next to the computer, indicating how much time the victim can survive. The puzzle murderer was in that factory, sitting quietly at his desk, looking very weak because of cancer. He told Matthew that if he could sit down and have a long conversation with him, his son would be safe.
In the poisonous house, the kidnapped victims woke up one by one. In addition to Daniel, Amanda is also on the scene (the only victim in the first episode). These victims learned from a tape recorder that although the escape exit will be opened in three hours, sarin gas is spreading in the house. Unless they can find an antidote, they will die within two hours. One of the antidote is in the safe in the room where they stay, and the key to opening is "in the back of their mind". There was a note and a key on the ground. The note read "Please don't try to open the door with this key". Xavier (drug trafficker) still tried to open the door with the key, but it touched the mechanism and shot him. Gus (the offender of embezzling public funds) looking out from the door of the door.
At this time, the scene shifts to the factory, and Ma Xianzheng talks with the puzzle murderer, trying to buy time to track the source of the signal sent by the computer screen. At this time, the victims were looking for an antidote in the house. They found a tape message for Obi (arsonist) in the basement and learned that Obi was the one who kidnapped them. Soon after, Obi tried to climb into a stove to get the antidote, touched the mechanism and was burned in the stove.
They found another audiotape about Xavier being condemned by a puzzle murderer for drug trafficking. In addition, they found a room with a large recess filled with used syringes, and inside it was a key to open the room containing the antidote. However, instead of jumping into the groove to find the key, Xavier threw Amanda in. Amanda finally found the key, but Xavier could not open the door in time, and the antidote disappeared.
The Jigsaw Murderer revealed that the people in the house are all criminals framed by Detective Matthew. If they find that Daniel is his son, they may kill Daniel. Matthew couldn't bear the endless conversation of the puzzle murderer, and decided to destroy the model of the mechanism he had designed, to test whether he could be intimidated by it, but Matthew ultimately failed.
Xavier left the team and searched for clues in the room on his own, and found that there was a colored number on the back of Gus's neck, and that the code was behind his neck. Xavier later killed Jonas, got his number, and continued to search for the remaining four victims. At this time, they learned that Daniel was the son of the detective who took them to jail (a clue is behind a photo), and then Lola fainted due to poison gas and was strangled to death by Amanda.
Addison staggered to a room and saw a glass box containing an antidote (originally Gus’ mechanism). When he reached for it, he couldn’t pull his hand and got stuck in the box because of the mechanism with many sharp blades. inside. Xavier heard Addison's cry for help, but didn't help her to untie the box. He wrote down the number on the back of her neck and left. Addison lost too much blood and died. Later Xavier discovered Daniel's true identity and hunted him and Amanda.
Matthew saw all this on the screen, lost control and started beating the puzzle murderer, almost killed him, and finally threatened him with a gun to take him to the house. After they left, the technology team discovered the source of the signal and followed along.
Xavier chased Amanda and Daniel frantically through a trap door leading to the bathroom (the game room in the first episode, where the feet sawn off by Dr. Gordon and the slightly decomposed body of Zepp and Adam were left). When Xavier threatened Amanda to provide her number, she asked him how he would read his number, and Xavier cut off the number on the back of his neck. Xavier then attacked the fallen Daniel, but Daniel pretended to be dead, and when he was not paying attention, he used Dr. Gordon's saw to cut his throat.
Matthew arrived at the house and entered alone, and finally found the door to the trap. At the same time, the SWAT team also entered the room of the screen signal, but found that it was different from the room on the screen. Everything that happened to the victim was actually over long ago. It was just broadcast on video tape and then transmitted to the factory where the murderer hid.
When Matthew went to the bathroom, a man wearing a pig head mask took a needle into his thigh, and Matthew became unconscious under the effect of the anesthetic. At this time, the factory's timer counted down, and a safe was opened with Daniel in it.
After Matthew woke up, he found himself tied to a water pipe, and a tape next to him told him that all of this was done by Amanda. After a series of reflections, we found that Amanda had already become a disciple of the puzzle murderer, and Ma Xianxian was her first game tester, as Matthew's revenge for framed her in jail. Amanda appeared at the door of the bathroom and said, "The game is over!" Outside the room, the dying murderer smiled.
