Jack uses Sherry to lure Kingsley out into the open, but Kingsley suspects a set-up and lays his own trap.

When Jack hits a dead end with his lead, he realizes he must persuade Sherry to help him get evidence against Kingsley.

Jack locates the man who forged the audio evidence, but his efforts to break him down are sabotaged by Sherry Palmer, who has a hand in the conspiracy.

Palmer's cabinet invokes the 25th Amendment in an attempt to remove him from power. They place him on trial for his extreme actions during the nuclear bomb threat.

Jack finds an ally who may help him escape from Kingsley's men.

Jack is captured and tortured by men who want the chip.

Jack, Kate and Wallace fight to escape from a deadly band of commandos.

Jack meets with the surviving Coral Snake Commando, who demands Kate Warner in exchange for evidence about the recordings.

Jack and Michelle question Syed Ali, who claims that the audio recordings are false.

Palmer, Mike and Lynne discuss various ways to dispose of the ticking bomb. They conclude that the desert is the best place to set it off.

Jack and Kate try to break Marie's resolve so they can learn the location of the bomb.

Brad Hammond comes over from Division to investigate the situation at CTU Los Angeles, and George and Tony convince him to let them maintain operations there.

Jack engages in a brutal contest of wills with Syed Ali.

Kate helps Jack to locate and identify Syed Ali.

Two traitors are uncovered. One is the mole in the Palmer administration who is working with Stanton. The other is the member of the Warner family who helped Syed Ali to bring the bomb into the country.

George pits Bob against Reza in hopes of learning which one is working with Second Wave.

Kim and Miguel are arrested and the police plan to take them back to LA.

Jack forces Nina to help with a sting operation against her contact in the hopes that he can lead them to the bomb.

Jack begins his interrogation of Nina and pushes all boundaries in order to force her to divulge the name of her contact.

George refuses to allow Jack to assist in Nina's interrogation. Jack resorts to blackmail to change George's mind.

George returns to CTU where he orders the medics to revive a badly injured Paula, who has vital information.

Jack warns Lynne about the impending bombing of CTU, but her efforts to alert Palmer are sabotaged by Eric, who has his own agenda.

Jack works to establish his cover with a small group of domestic terrorists. He learns that their target hits very close to home.

Over a year has passed since the events of Day One. President David Palmer is fishing with his son in Oregon when he learns of an emergency. He is taken to his underground bunker, where he learns that a Middle Eastern terrorist group known as Second Wave is planning to set off a nuclear bomb in Los Angeles