Trouble On All Sides by W. J. Humphrey

When Ben Wrights grandfather starts forgetting things, Ben realizes its his responsibility to make sure the Double Bar W ranch in the small town of Little Black Water runs smoothly. But sweeping in from the western part of the territory, like a swarm of locusts through a wheat field, is an outlaw gang run by ex-con Runt Shelby. Intent on terrorizing the area, they loot towns, rob stagecoaches, and rustle cattle. And theyre heading straight toward Little Black Water. Ben must quickly become a man, or he will lose everyone and everything dear to him: his sister, his grandfather, and the Double Bar W ranch.