Fifth Quarter — Tanya Huff

THE SONG OF DEATH

Bannon and Vree, brother and sister, they are assassins of the highest caliber who have long plied their trade for the Havalkeen army. But all their skill and experience cannot save them from a magic-sprung trap that will see the two forced to share one body when the very man they've been sent to assassinate steals Bannon's body for himself. How long brother and sister can coexist in one body neither can guess. And so they set out to catch and defeat this foe who has already bested them once.

But when Bannon and Vree confront this master of a magic beyond their comprehension, he offers them a terrible choice--to continue their new dual existence forever, or to betray the Empire they have served all their lives. For it is not control of Bannon's body which is Gyhard's true goal but rather the body--and with it the identity and power--of the Imperial Prince!