Don Cheadle and Guy Pearce star in Traitor, a terrorist thriller conceived by Steve Martin that the Village Voice calls "uneven yet engrossing." In it, Cheadle plays an American-born mercenary who at age nine witnessed his Sudanese Muslim father die in a car bombing. When the flick finds him as an adult, he's seemingly gone from U.S. Special Ops to selling explosives to jihadists, with Pearce as the FBI agent on his tail. The......