Sarah Arthur is a fun-loving speaker and the bestselling author of a dozen books for teens and adults, including "Once a Castle" (WaterBrook/Penguin Random House; on sale 2/11/25) and the bestselling and Christy Award nominated "Once a Queen." Among other nerdy adventures, she was a founding board member of the annual C. S. Lewis Festival in Northern Michigan, and codirects the Madeleine L’Engle Writing Retreats. She lives in Michigan with her husband Tom and their preteen/teen sons, whose feedback on her fiction both harrows and delights her soul.