The book takes a hard hitting look at the drug wars taking place in Mexico between competing gangs, cartels, and mercenary factions; their insurgency against the Mexican state; the narco-violence and terrorism that is increasingly coming over the border into the United States, and its interrelationship with domestic prison and street gangs. Analysis and response strategies are provided by leading writers on 3GEN gang theory, counterterrorism, transnational organized crime, and homeland security.

Narcos Over the Border is divided into three sections: narco-opposing force (NARCO OPFOR) organization and technology use; patterns of violence and corruption and the illicit economy; and United States response strategies. The work also includes short introductory essays, a strategic threat overview, an afterword and selected references. Specific topics covered include: advanced weaponry, internet use, kidnappings and assassinations, torture, beheadings, and occultism, cartel and gang evolutionary patterns, drug trafficking, street taxation, corruption, and border firefights.

This book was published as a special issue of Small Wars and Insurgencies.