In this last season, Renee Walker died at Jack Bauer apartment. Jack himself faced a new mission to assist CTU on twenty four hour. Jack mission was started when he was approaching by one of his old informant. The informant said that he has something to tell about the terror that will take out in that day and now he was being after for his death.
Hassan, the president of Kamistan(surely no such kind of country on the map, but the idea was similar to Iran) was under death penalty threat at the United States soil. CTU then send chopper to transfer the informant from the secure space under fire from the groups of people who didn't want the "little" secret revealed. During the transportation phase, the CTU black chopper was annihilated by the RPG fire from the rooftop sending the informant to the grieve along with several CTU members on board.
Jack's planning on leaving the city with his family became unavailable. He was called to finish his expertise work at the field. CTU and president Taylor were look like counting on him to solve the case. Hassan and his family was in UN to sign peace treaty. Hassan was faced murdered. When the terrorist fail to retrieve him, the terrorist was using the nuclear device which wanted by Hassan closed relative, his own brother to transport to Iran. His brother secretly bought the device from the Russia black market dealer at USA. But his brother planned to transport it to the Iran and not planning blow at the US soil. His allied betrayed him and killed him before the CTU arrive. The nuke for the Hassan life. When near desperate, the president Taylor Chief of staff planned for sudden attack to retrieve Hassan during the rescue mission from the UN.
Hassan then turned himself to the terrorist for the nuke device. He was beheaded by the terrorist before Jack Bauer and CTU successfully rescue him. One of Hassan right hand was coorporate with the terrorist to acquire Hassan, his daughter and CTU. All dead and leading no lead. Suddenly showed up that one of the CTU staff caught up coorporate with the Russian. She was CTU senior analyst computer. and the situation became complicated when President Taylor pushed the peace treaty sign through Hassan Wife under "threat of US invasion". Her wife had already own information that her husband was killed by the Russian president who wanted the treaty failed. Lavrov, the Russia president was given unauthorized ordered to finish out Hassan's life. The movie series are thrilling enough but the bad news came that the series ended here. But good news is the stories will be made on the large screen.