An unaccounted for 40 hours: the crucial piece in the case of the missing UVA student

Did abduction suspect Jesse Matthew fraternize with missing college student Hannah Graham at a Charlottesville, Virginia restaurant?

Did the pair leave together?

And what about the unaccounted for 40 hours between Graham's disappearance, and the first report of her having gone missing?

With Matthews having been extradited from Texas to Virginia, watch the above video as CNN's Jean Casarez travels to Charlottesville in search of answers.