The Jackals (Book 1) by William W. Johnstone
Holed up in a West Texas way station after a savage Indian massacre, ex-cavalry sergeant Sean Keegan, bounty hunter Jed Breen, and ex-Texas Ranger Matt McCulloch are making good on a promise to a dead man- deliver his blood-soaked stash of $50,000 to his kin-especially when the dying man promises them five grand. The trio, soon to be known as the Jackals, aren't all that honest, but they have one thing in common- they keep their word, and they gave their word to a dying man. It's rough enough backtracking over warpath country. Worse-turns out the loot they're hauling is the stolen property of the vengeful Hawkin gang, and these prairie rats are merciless stone-cold killers. But McCulloch, Keegan, and Breen aren't riding for their own lives. They're protecting a prisoner in tow-a hot-as-a-pistol female who can shoot with the best of them. The Jackals are ready for a showdown-and may not live to spend that $5,000.