Raiders of the Misson San Juan by Scott Connor
Marshal Lincoln Hawk is on the trail of the Shannon gang when he learns to his surprise that they have already been killed. He alone believes that the dead outlaws have been incorrectly identified, so he continues on the owlhoot trail...His search leads him to the Mission San Juan where he finds the gang still very much alive as they prepare to claim a stash of Mexican gold. They will stop at nothing to protect their alibi and no help is forthcoming from the peaceful mission padres. Can Lincoln hold his own when faced with an army of gun-toting raiders?