Deadly Game (GhostWalkers, Book 5)

It begins as a mission to protect a politician from an assassination threat. But the operation takes an unexpected turn when Mari, a mysteriously beautiful GhostWalker, is taken hostage. At the same time, Ken Norton, expert assassin and himself a GhostWalker warrior, is on a mission of his own€"one that reaches into Mari€s own past. No stranger to the ways of violent warfare, Mari must join forces with Ken and trust his every move€"each one more intimate than the last.

*Publishers Weekly