Book 6 of the Zombie Terror Wars.
"As Federal Agent Chuck McCain and his men work to clear out the last remaining zombies on the east coast, a new and sinister threat raises its head. A traitorous FBI agent plots to infect Los Angeles, San Francisco, and San Diego with the deadly bio-terror virus. At the same time, the Tijuana Cartel wants vengeance for the hundred plus gangsters that Chuck’s team took out in Atlanta months earlier. Vicious assassination teams are enroute to the agents’ homes to kill the police officers and their families. McCain is torn between stopping the terrorists from releasing the zombie virus on the west coast and saving thousands of lives or confronting the Mexican cartel that may have just bitten off more than it can chew."