Darkyn series by Lynn Viehl
SHE RESTORES THE LIGHT OF HOPE. Dr. Alexandra Keller is Chicago's most brilliant reconstructive surgeon. HE DWELLS IN SHADOW. Michael Cyprien is New Orleans's most reclusive millionaire--and in desperate need of Dr. Keller's skills. A NEW DAWN AWAITS THEM BOTH. . . . Beneath the foundation of a mansion in the heart of the Garden District, Alexandra will perform an illegal surgery. Her patient's disfigurement is beyond medical repair. But his body's ability to recuperate from his wounds borders on the miraculous. Alexandra knows Michael Cyprien is no ordinary patient. Intrigued by how his remarkable physiology might benefit medical science, she is even more compelled by his presence--and the mystery surrounding him and his associates, a cadre of immortals who call themselves the Darkyn.