Invincible : Mercenary by name and by nature, Carson is a Lakota Sioux who stays to himself and never keeps women around long enough for anything emotional to develop. But working with his friend Cash Grier on a complex murder investigation provides Carson with another kind of fun . . . shocking Cash's sweet-but-traditional secretary, Carlie Blair, with tales of his latest conquests. Then Carlie lands in deep trouble. She saw something she shouldn't have, and now the face of a criminal is stored permanently in her photographic memory . . . and Carlie is the key piece of evidence that could implicate a popular politician in the murder case. Her only protection is Carson . . . the man she once despised. But when she learns that Carson is more than just a tough guy, Carlie realizes she's endangered herself further. Because now her only chance to live means losing her heart to the most dangerous kind of man . . .