This article contains plot spoilers for the movie “Spencer.”In one of the key scenes in the critically-acclaimed new movie “Spencer,” Kristen Stewart, the actress who plays the doomed Princess Diana, fixes her eyes on a palace chef and asks: “Will they kill me, do you think?”The disturbing question, featured in the movie trailer, echoes conspiracy theories about the high-speed Paris crash that killed the former wife of Prince Charles on August 31, 1997, at the age of 36.