Well, to be honest several of Mr. DeMille's works were on sale at Amazon so I got three I have not read. "The Panther" is much better than "The Lion". Mr. DeMille moves John Corey and the action from the US/NYC to Yemen. Mr. DeMille did his research. This novel has much less violence and is more about the politics of terrorists and Arab countries. He made Yemen enticing but was also very honest about the dangers.
Also, this has a conspiracy and Paul Brenner from "The General's Daughter".