Tomás is too shy to go out and meet the kids in his neighborhood, even with his mom's encouragement. Instead he just sits on his stoop, watching the world go by. On the night of Halloween, opportunity arrives in the form of a tiger costume, complete with a mask that hides his identity. He can go trick-or-treating without anyone knowing it's him. But Tomás soon discovers his costume doesn't hide him quite as well as he thinks.