The Night Ends with Fire is an adult fantasy novel by K.X. Song, published by Ace (an imprint of Penguin Random House) on July 2, 2024. It is the first book in The Dragon Spirit Duology, running 432 pages in hardcover and 464 pages in paperback (published July 8, 2025).

Inspired by the legend of Mulan and the classic Romance of the Three Kingdoms, the story follows Meilin, a young woman trapped by her father's opium addiction and an impending forced marriage. She disguises herself as a boy and enlists in the imperial army in her father's place. In the army, she earns recognition and forms a bond with Sky, a prince-turned-training-partner, while navigating the chaos of a kingdom at war. Visions of a powerful sea dragon spirit offer her freedom and magic — but at a deadly price. As political machinations intensify, Meilin must choose between loyalty, love, and her own survival.

An instant New York Times bestseller, a #1 Sunday Times bestseller, and a USA Today bestseller, the novel has been praised for its sweeping romance, feminist themes, wuxia-inspired action, and immersive world-building drawn from Chinese mythology and history.