When ex-Special Forces Captain Orlando Black stumbles upon a would-be mugging behind a San Antonio gas station, his fighting instincts kick in. Too bad the guy he saves doesn't want his help-and to make matters worse, he's unwittingly waded into an undercover investigation headed by the DEA. The Feds aren't impressed with Black's heroism. They slap him with an ultimatum: work with them on their top-secret case, or go to jail for obstruction. Roped into investigating a shadowy underground fighting ring, Black quickly finds himself embroiled in a deadly operation that transport him on a perilous journey from dusty Texan towns to the remote mountains and canyons of Mexico. Going toe-to-toe with skilled fighters, bloodthirsty cartel bosses, and even an old US army tank, Black must struggle for survival while deep in hostile territory. If his cover is blown, he's a dead man. Can he stay alive long enough to blow the lid on this illegal fighting ring? Or has he signed his death warrant?