'Dry Gulch Outlaws':

Link Bonner has already tracked and killed two of the Carp brothers who raped and murdered his young Pawnee bride. Then when he gets word of the whereabouts of the others, he leaves Emma Fitzgerald behind him in Fort Union and heads for Yuma. But Emma has tracked him down and now intends to march straight into his heart. Initially reluctant, he grows fond of her — but first he must finish what he started.

Eventually only Spike Carp remains with his gang of cutthroat Mexican bandits, and Spike intends to repeat with Emma what he and his brothers did to Yana. Together, and against all the odds, Emma and Link must face the killers.

'The Dark Trail to Nowhere':

Lucas Santana is a freelance range detective working for both the US Marshals Service and the Pinkerton Detective Agency in the 1880s. A wanted man in some States, he takes great care where he rides and has a number of off-the-cuff — and is not too shy about lining his own pockets in order to finance his Wyoming Wildcat ranch.

When a number of gold coins surface in South Texas, loot from a long ago three-quarters of a million dollar heist at the end of the Civil War, both Pinkerton and the US Marshals call on his services to find the source of that gold. The problem is, he is not the only one searching for it. Then when a fellow agent is murdered in cold blood, Santana's quest becomes personal, and he sets off on the long dark trail to nowhere....

George Snyder