Yet again, they make it look so easy. On the surface, “Heartless” looks like a good stand-alone episode of Sleepy Hollow, as our heroes find themselves facing off with a succubus and racing to foil Henry’s plan. But upon closer inspection it reveals itself as having a lot of important character and plot moments for the season on the whole. Whether it’s partnerships, relationships, or spy games, there’s a lot going on here. Throw in that baby Moloch is now hanging out (complete with a psychic connection to Katrina) and this could be the hour that points the way to the next phase of this season.