Those who need to be strong can look up to the Hulk, those who dream of being able to fly, to Superman. But who can children who need to make themselves invisible look up to? Filmmaker Martijn Blekendaal sets out to find a new superhero as he tells the stories of four children - now adults, some as old as 85 - who became masters at remaining unnoticed. From Mrs Walvisch, who hid in silence during World War II, to Samir, whose safety depends on invisibility, and Mohammed, who kept his identity hidden to flee Gaza.