Branded by Fire: Psy-Changeling Series, Book 6 (Unabridged)
by Nalini Singh
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When a brilliant young researcher is kidnapped, DarkRiver sentinel Mercy, a cat, and SnowDancer lieutenant Riley, a wolf, must work together to track the young man - before his shadowy captors decide he's no longer useful. Along the way, the two dominants may find that submitting to one another uncovers not just a deadly conspiracy, but a passion so raw that it'll leave them both branded by fire.
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Angela Dawe does a great job reading this series. I have them all and they are worth every penny!! Plus, this book has the first instance of a mating between the cats and the wolves, enjoy!