A ruthless enemy is out for vengeance…
and it’s up to a K-9 team to stop him

Sergeant Tyson Wilkes is determined to protect his Rocky Mountain K-9 Unit—especially against an unknown assailant with a taste for explosives. Fortunately, Denver detective Skylar Morgan has the toughness and smarts to help Tyson and K-9 Echo find answers…even if she’s stepping into the crosshairs with them. But can they disarm this volatile killer before the next bomb goes off?