The first draft didn’t work. Australian mezzo-soprano and novelist Indyana Schneider says that plainly, without flinching. By the time Schneider’s debut novel, “28 Questions,” hit shelves in January 2022, she’d already completed a full draft of her follow-up, “Since the World is Ending,” and it wasn’t good. But what followed was, in her words, “a really fun journey.” That journey {…}