Border Guns by Max Brand (Good, 1988, HC, 370 pgs, Thorndike Press Large Print)

Former library book: cover and pages have light wear. ISBN 0896211509

Border Guns finds Lew Weldon relaxing in a San Trinidad hotel, where the warm weather, hot food, and lovely ladies match his disposition exactly. A man of rough skills and sharp shooting, Weldon reluctantly hires on to protect invalid Helen O’Mallock from unknown killers, a job calling for more delicacy than riding the range. Still, he’s making headway solving the mystery until the night he leads a foray across the border, working for beautiful daredevil Francesca Laguarda, as unlike Helen as she could be, or, perhaps, the other side of the same coin.