What’s left is another all-too-typical tale: a Ryan Murphy production filled with potential… that has no idea what to do with it. When we meet “The Shards'” version of Bret (played by Igby Rigney), he’s preparing for his senior year by savoring his friends and his freedom. Together with Bret’s girlfriend Debbie (Hayes Warner), the foursome are thick as thieves — in part, because they have to be. But that doesn’t mean they share everything, and Bret, in particular, is holding onto a few secrets. Rigney’s knowingly performative lead turn is solid, and there’s thankfully more on Murphy’s mind than his sloppy “Substance” knock-off, “The Beauty.”