Cassandra Clare is the creator behind the sprawling, beloved Shadowhunters universe, which launched in 2007 with City of Bones. The dark, unforgettable series centers on a race of angel-blooded warriors tasked with defending mundane society from demonic takeover.  More than a dozen books later, Clare’s is one of modern fantasy’s richest worlds, populated with deeply human, wickedly funny characters, and boasting a mythology that fans (and other writers) can’t stop exploring.  To kick off the B&N YA Podcast, Clare sat down with host Melissa Albert to talk about what made her a writer, how her ideas develop, and why she’s still mad at C.S. Lewis.