Katja Millay is an American author known for her young adult novels, particularly in the contemporary romance genre. One of her most notable works is "The Sea of Tranquility," which has garnered a strong following and critical acclaim for its deep emotional themes and complex characters. Millay's writing often explores issues of love, loss, and redemption, resonating with many readers. If you're looking for information about a specific book or aspect of her work, feel free to ask!