Invincible by Diana Palmer
HE'S EVERYTHING SHE FEARS... AND EVERYTHING SHE WANTS
Rugged mercenary Carson is a Lakota Sioux who never keeps women around long enough for anything emotional to develop. But working on a complex murder investigation provides Carson with a new pastime - shocking sweet-but-traditional secretary Carlie Blair with his conquests.
Then Carlie lands in deep trouble. She sees the face of a criminal and it's stored permanently in her photographic memory. Carlie is the key piece of evidence that implicates a popular politician in the murder.
Her only protection is Carson - a man she once despised as just a tough guy. Carlie realises she's losing her heart to the most dangerous kind of man...