Andrea Cremer is the internationally bestselling author of the Nightshade series, which includes "Nightshade, Wolfsbane, Bloodrose, Snakeroot, Rift "and "Rise." She is also the author of "Invisibility, "which she co-wrote with David Levithan. When she's not writing novels, Andrea puts her Ph.D. to work teaching classes in writing and history at Macalester College. She lives in Minneapolis, MN. You can visit her online at www.AndreaCremer.com or follow her on Twitter @andreacremer.