The Knife of Never Letting Go by Patrick Ness

In the all male world in which Todd has grown up, there area surprising number of secrets, considering the fact that all males' thoughts are audible. When he discovers a girl in the swamp, the two of them, along with Todd's talking dog, are forced to flee the thought noise of Pretistown and the sinister men whose desire for power compels them to cut a path of terror in the New World.

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