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Truth Among Friends is the 3rd chapter of Eldest. It takes the point of view of Eragon.
Summary[]
Eragon tells Nasuada about Ajihad's last words and gives her his fealty as a Rider, rather than swearing fealty to the Council of Elders. After this, he finds Arya and tells her what he did. She is angry at first, but forgives him once she hears the whole story.