Nicolás is a 10-year-old boy with Down syndrome. Every year, his mother made him a disguise. He was a monkey, a brave pirate, a dragon giant. Unfortunately, his mother dies and Nicolás goes to live with Mia and Tomás, his loving grandparents, and his cousin David, who suffers from nightmares. Nicolás keeps an old man trunk with all its magical costumes. With them, he will undertake an adventure to save his cousin of his nightmares and, incidentally, to a whole kingdom submerged in chaos.