Kathryn repeatedly recalls thinking that her marriage was "a good marriage". What does she learn about marriage?

Kathryn's illusions about her marriage unravel entirely like the scarf she pulls apart thread by thread during the frenzy of shock and grief that follows her encounter with Muire. Knowing that her husband was "two different people" throws Kathryn's own identity into question as she wonders if she herself was "the pilot's wife"—or if Muire was. Kathryn grapples with her anger at Jack for "gutting" her memories, struggles with the best way to help their daughter through her grief, and blows up at the pilot union's grievance expert, Robert Hart, who has assisted her through the disaster's aftermath, accusing him of "using" her to extract information about Jack's activities. The gamut of emotions that Kathryn experiences before she comes to terms with her husband's death and betrayal call into question all of her beliefs about what constitutes a good relationship. At the same time, her incipient romance with Robert reaffirms possibilities.