Covert Warriors (A Presidential Agent Novel)

At a Mexican roadblock, a US Embassy SUV is stopped at gunpoint, three of its passengers murdered, and a fourth kidnapped. Everything points to the drug cartels, especially when the kidnappers say they will return the hostage if a cartel kingpin is released from US federal prison. But when word gets to Castillo and his group of retired spies and special operators, they have their doubts.