Worlds of Exile and Illusion: Rocannon's World / Planet of Exile / City of Illusions (Hainish Cycle, #1-3)

by Ursula K. Le Guin

since the coming of the Shing and the downfall of the League, the scattered community of man had mistrusted trust and used the spoken word. A free man can speak freely, but a slave or fugitive must be able to hide truth and lie.