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True colors are revealed in the midst of some very intense circumstances. Meanwhile, Jack and Chloe launch a plan to eliminate the terrorist threat and keep London safe from any more attacks, but to do so first he and Kate need to track down some crucial leads with little time to spare.

Jack remains laser-focused on pursuing his remaining leads; emotions escalate when Kate learns the truth about her husband; and Audrey confronts Mark about the duplicitous things that he has said and done. At the same time, the terror threat widens and the potential devastation becomes all too clear.

Jack leads Kate and Mark on a mission to avert an international crisis, as Audrey tries diplomatic means to avoid full-scale war.

The day comes to an end with Jack doing everything in his power to prevent a terror plot and an international crisis. But to save the world, he's faced with an unthinkable and grave decision.