The Son Of Summer Stars

A secret haunts Jan's dying father, Korr-a secret so dark that, if exposed, could bring the downfall of the Firebringer. Jan is left with its terrible burden, and an impossible choice-renounce Tek, his beloved mate, and lose forever the kingship of the unicorns, or return and face the consequences of his father's acts, and of his own.
Jan, the prince of the unicorns, uses his knowledge of fire to form a historic alliance between his people and their former enemies and to return the unicorns to their ancestral homeland.