Former Delta operator Patrick Darwin leads Phalanx Security's best private security team, running protection details with Cal Wafer, former SEAL Team Six sniper, and Gabe Henderson, former Detroit SWAT assaulter. They're rotating out of Baghdad when VIP client Martin Lindy demands immediate protection along the Texas/Mexico border, where he and his crew are spending tax dollars building a virtual fence. Sounds like a paid vacation. Then they run into Maro, a Cuban expatriate trained by the Soviets to kill Afghans. Now he's a mercenary working for the Luna Cartel, protecting drug shipments and dismembering troublemakers with his Russian entrenching shovel. On the hostile line in the sand between Texas and Mexico, Maro fights for money and the hell of it, using brutal guerrilla tactics to get what he wants. No way these new boys are going to stop him. But he's never fought a crew like Darwin's before--Maro and his cartel lords better prepare for a level of professional warfare they have never seen.