Dark Side of the River by B.J. Daniels

Grudges run deep between two ranch families. And so do secrets…

There’s no avoiding anyone in Powder River’s small community—not even a bitter rival. For years, Cooper McKenna has been thrown together with Tilly Stafford, competing against her at summer rodeos. With all the bad blood between their families, he never imagined they’d be forced to work together. Then Tilly’s younger sister is shot, and Cooper comes under suspicion.
Determined to get answers, they reluctantly team up, animosity turning to something far more heated—and no less dangerous. Because someone is watching, with a lot to hide and every reason to kill again…