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A wave of terrorist attacks hits 10 U.S. cities in 11 weeks, and President Wayne Palmer is forced to consider desperate measures.

Jack escapes from Abu Fayed and tries to warn CTU that Fayed, not Assad, is behind the bombings, and the strike on Assad should be canceled.

Jack and Assad hope that Masheer, one of Abu Fayed's men, will lead them to Fayed.

The stakes are raised in the search for Fayed and Numair, and Jack takes over the operation at President Palmer's request.

CTU and the Palmer administration are left reeling by the terrorist incident in Valencia, but terrorist Abu Fayed has problems of his own.

Jack's family becomes part of the investigation; politicos Reed Pollock and Thomas Lennox strategize on how to advance their agenda; and President Palmer delivers an address to the nation.

Jack and his brother's fortunes are reversed, and Lennox lobbies President Palmer hard to approve Executive Order 1066.

Darren McCarthy runs into some trouble trying to deliver a specialist to Fayed, and those dissatisfied with President Palmer's handling of the crisis begin to align.

The search for Fayed proceeds through a search for coconspirator Gredenko, and Graem's wife, Marilyn, may be able to help.

Chloe covers for another agent; Milo is thrown into unfamiliar duties; and Jack faces a hard compromise. Reed Pollock:

Jack follows up on the lead his father gave him; Fayed gets assistance from a Russian accomplice; and President Palmer tries to cement an unlikely alliance.

An attempted coup d'état rattles the Palmer administration, and Jack warily accepts an offer of help from former president Logan.

Mike Doyle joins CTU as head of Field Ops, just in time to oversee a crucial mission. Meanwhile, Jack has information CTU needs and no way to get it there, and Charles and Martha Logan have a tense reunion.

Jack deals with devastating news, and acting president Noah Daniels (Powers Boothe) mulls enacting controversial measures.

Gredenko puts his Plan B into action; new evidence about a CTU agent comes to light; and Karen tries to shift the balance of power.

Jack interrogates Gredenko and tries to get him to lead CTU to Fayed, while Vice President Daniels invokes the 25th Amendment and calls for a Cabinet vote on Wayne Palmer's fitness to be president.

President Palmer makes a bold gambit, and Jack changes his strategy about Fayed.

Jack risks sparking an international incident when he launches a rescue mission, with a little clandestine help from Chloe.

While Vice President Daniels and Lennox mend fences, relationships are shattered at CTU.

CTU searches for a lead on Cheng from Audrey, and acting president Daniels believes there may be a leak at CTU or the White House.

Doyle leads a CTU tactical team to a location thought to be Cheng's safe house, and Lennox and Daniels concoct a plan to feed disinformation to the Russians.

The drama escalates between the U.S., China and Russia, and things get personal for Jack.

Vice President Daniels orders CTU to exchange Josh Bauer for the Russian sub-circuit board, but elements in both the White House and CTU second-guess his decision.