In Thaw, the twin diminutive "bird-rider" warriors Rist and Rusk ventured southward from their primitive, mist-bound homeland at the foot of receding glaciers, to warmer and more civilized lands downriver, where they experienced rewards, recognition, and resentment. But now, because of their notable achievements, the youngsters bear their new "man-names" -- Thist and Thusk. Holding important positions in the Sisterdom of...