The Standoff von Scott Blade

Lead Federal Agent Toni Adonis sends an agent undercover, posing as a recruit to investigate a mysterious militant-cult called The Athenians. She watched her agent go through the front gates into their compound in rural South Carolina. But he never came back out. No radio check. No sign that he’s even still alive.
After a rescue attempt goes horribly wrong, the group’s terrorist leader and his closest guards escape. Desperate, Adonis will do whatever it takes to catch him.
Enter Jack Widow, a drifter with a dark past. Taking a ride, heading to warm climates, Widow spends a day with a close-knit family. But things go from good to deadly when the fleeing cult-terrorists end up at their front doorstep.