From the back cover:
Champions of the Unconquered Sun
Elemental forces of destruction, the Dawn Caste of the Solar Exalted is the mailed right fist of the Unconquered Sun. Yet these peerless warriors are not mere bloodthirsty killers. With its mighty war-arts and terrible visages, the Dawn Caste brings the light of the Unconquered Sun into dark places. Know fear, you who would stand against the warriors of the sun, for no one can hide from the light of dawn.
Masters of the Killing Arts
Caste Book: Dawn is first in the Caste Book line for Exalted—books describing the different castes of the Solar Exalted. Within its pages are all of the secrets of the Swords of Heaven, from their matchless battle-Charms and fragmentary memories of the First Age to the creeds and philosphies that unite them. This book also contains the new Charms, rules, spells, and artifacts that Dawn Caste characters will need to carry out their holy mission.