The Council of Shadows - S. M. Stirling

Adrian Breze has long defied his pure-bred Shadowspawn heritage as part of an ancient race of shapeshifters who once reigned supreme. But when his ruthless sister Adrienne kidnapped his human lover Ellen, he emerged from seclusion to rescue her.

Before her defeat, Adrienne revealed that the Council of Shadows was marshalling its strength to rule the world once again. To stop them, Adrian and Ellen must ally with the Brotherhood, a resistance group dedicated to breaking the Council's hold on humankind.

In the coming confrontation, Adrian must fight not only the members of the Council but also his own nature...and, he will come to suspect, traitors within the Brotherhood itself…