"The Lion's Game" by Nelson DeMille follows former NYPD detective John Corey as he hunts for a dangerous terrorist named Asad Khalil, also known as "The Lion." Khalil is a skilled assassin responsible for a deadly attack in New York City. Corey, recuperating from his injuries, becomes involved in the FBI's manhunt for Khalil, who is a highly intelligent adversary with his own set of motives.