A Game of Thrones
How we cite our quotes:
Will had to call out. It was his duty. And his death, if he did. He shivered, and hugged the tree, and kept the silence. (1 Prologue.91)
We start our betrayal early, in the Prologue. Here Will betrays both his leader and his duty. But he's not betraying these things just to be a jerk: he's just trying to save himself. Can we forgive him for this?
"Oh, I love riding," Sansa said. (16 Sansa 1.75)
When there's a chance of spending time with Joffrey, Sansa claims to love riding. But check out what she said earlier to her sister Arya: "'I hate riding,' Sansa said fervently" (16 Sansa I.20). Hmmm. So, in order to fit in with her boyfriend, Sansa is willing to lie about her own desires: is she betraying herself?
"He reports to Varys. The Spider has taken a great interest in you and all your doings." He shifted in the window seat. "Now glance at the wall. Farther west, above the stables. The guardsman leaning on the ramparts?"
Ned saw the man. "Another of the eunuch's whisperers?"
"No, this one belongs to the queen." (26 Eddard 5.74-76)
This is Petyr talking, so maybe we should, you know, not believe his lying face. But on the other hand, this is a good introduction to how betrayal and spying are pretty common in King's Landing. Up north, people worry about raiders and monsters. But down south, you have to worry about other people's schemes.