Captain Billy Boyle is assigned to track down a French traitor, code named Atlantik, who is delivering classified Allied plans to German leaders in occupied Paris. The Resistance is also out for blood, after Atlantik's previous betrayals led to the death of many of their members. But the plans Atlantik carries were leaked on purpose, a ruse devised by a colonel to obscure the Allied army's real intentions to bypass Paris in a race to the German border. Now Billy and Kaz are assigned to the Resistance with orders to not let them capture the traitor: the deception campaign is too important.
