The list author says: "Although Preston and Child write their books so that most can be picked up at any time, there is a bit of an order to the Pendergast series that will help the reader understand the back stories"
"9th Book in order. Pendergast returns to New York City. Two of his close friends have been attacked by a man that is supposedly dead and the agent investigates a Zombi cult. Not necessary to read in a certain order."