Cassandra Clare is the author of the #1 New York Times, USA TODAY, Wall Street Journal, and Publishers Weekly bestselling Shadowhunter Chronicles. She is also the coauthor of the bestselling fantasy series Magisterium with Holly Black. The Shadowhunter Chronicles have been adapted as both a major motion picture and a television series. Her books have more than fifty million copies in print worldwide and have been translated into more than thirty-five languages. Cassandra lives in western Massachusetts with her husband and three fearsome cats. Visit her at CassandraClare.com. Learn more about the world of the Shadowhunters at Shadowhunters.com. Sarah Rees Brennan is the New York Times bestselling author of the critically acclaimed Unspoken and The Demon's Lexicon trilogy. Her most recent book, In Other Lands, was a Hugo Award finalist. She lives in Ireland. Visit her at SarahReesBrennan.com. Maureen Johnson is the New York Times bestselling author of over a dozen YA novels, including 13 Little Blue Envelopes, The Name of the Star, Suite Scarlett, and Truly Devious. Visit her at MaureenJohnsonBooks.com, MaureenJohnsonBooks on Tumblr, or @MaureenJohnson on Twitter. Robin Wasserman is the author of Girls on Fire, an NPR and BuzzFeed Best Book of the Year. She is a graduate of Harvard College with a Master's in the history of science. She lives in Los Angeles, where she writes for television.