Moffitt and Tully allow themselves to be captured to get information from Craig -- an American POW -- about Rommel's new battle plans. However, Marston, another POW, tells them that Craig died. However, Dr. Phillips, the camp medic, supposedly has some information about the plan. When the doctor treats Moffitt's arm, he puts the code name of the mission on the underside of the bandage: Operation Nachtigall. However, it soon becomes evident that either Phillips or Marston is a traitor, and it is up to the Patrol to figure out which, as they are both now giving the Patrol conflicting information.