Five episodes into its debut season, Damon Lindelof and Tom Perrotta's HBO drama "The Leftovers" has remained mesmerizingly bleak and doesn't seem to be slowing down in terms of emotional heft anytime soon. In both a new photo (above) and clip from this Sunday's upcoming episode, "Guest," the focus is all on Carrie Coon's Nora Durst, a widow whose entire family vanished in the show's mysterious rapture.