Tony Stark has faced villains, aliens, and world-ending threats—but nothing could prepare the Avengers for his biggest secret. For five years, Tony has kept his daughter, Y/N Stark, hidden from the world. She’s a sweet, mischievous, bright-eyed five-year-old with copper-red curls, a brilliant mind, and one very protective superhero for a dad. But when Y/N unexpectedly walks into Avengers Tower and calls Tony “Daddy,” the Avengers discover that Iron Man has been keeping a tiny Stark all to himself. Now the Avengers have a new little sister to protect—and Tony is about to learn that keeping his daughter away from trouble might be harder than fighting Ultron. Because saving the world is easy… being a dad is the real challenge. ❤️