Stiles and Lex are on a plane. Lex sees someone whom he thinks looks suspicious and he notices that they're not on the right course. And when they learn that the pilot is not answering when he is called, they call in to say that they may have been hijacked. So when word gets to Gage, he has Haisely find out what is going on. Have they been taken over by someone who plans to use the plane as a weapon? If so do they shoot it down? Meanwhile Stiles and Lex try to see if they can regain control of the plane.