NATIONAL BESTSELLER   Born to the life of a Southern gentleman, Dr. John Henry Holliday arrives on the Texas frontier hoping that the dry air and sunshine of the West will restore him to health. Soon, with few job prospects, Doc Holliday is gambling professionally with his partner, Mária Katarina Harony, a high-strung, classically educated Hungarian whore. In search of high-stakes poker, the couple hits the saloons of Dodge City. And that is where the unlikely friendship of Doc Holliday and a fearless lawman named Wyatt Earp begins— before the gunfight at the O.K. Corral links their names forever in American frontier mythology—when neither man wanted fame or deserved notoriety.