 A hostage situation at the Ontario airport prompts Lynn McGill to be sent to CTU in order to oversee the situation, though criticized for the adherence to protocol.Buchanan interrogates a suspected mole, Spenser Wolff, and learns he's working for Walt Cummings as part of an internal investigation.Programmer Jacob Rossler, is captured for aiding terrorists, and Buchanan and McGill agree to grant him immunity in exchange for information, but Rossler is killed before he can provide the results.