Callaghen€s business is soldiering. For twenty years he€d fought all over the world, from China to the deserts of California; now he€s a private in the U.S. Cavalry, poorly paid, his enlistment about to run out. He€s ready to move on€¦until he comes across a startling discovery: a treasure map belonging to a dead lieutenant who may not have been all that he seemed. The map points the way to an underground river of gold€¦or does it? To find out, Callaghen will have to fight the toughest war of his life: against a fierce Indian warrior, a vindictive commanding officer, and a ruthless gang of outlaws who€ll turn what may be a river of gold into a river of blood.