Gang violence has reached epic proportions in America. Restrained by the rule of law and shrinking budgets, local police do not have the resources, manpower, or training to adequately address gang violence. Military units are not legally allowed to intervene. Unfortunately, this leaves criminal street gangs free to wreak havoc over large areas of Los Angeles.

In this gripping tale, Gunnery Sergeant Jack "JD" Davis, an active duty Special Operations Marine, has always tried to do the right thing and provide calm strength, even in highly stressful situations. But when members of the Gatos gang attack his niece and then that same gang brutalizes the other members of his family, he is pushed beyond the point of restraint. When JD decides to unleash his lethal skills to neutralize the threat, the Gatos gangbangers have no idea they are about to experience the full weight of having a lion at their gate.