Airin and her friends are rooftoppers in Hong Kong. They refuse to play by the rules and sneak to the top of the city's soaring skyscrapers. But their high-rise antics are not just for thrills. Two years after the pro-democracy 'Umbrella Movement' was cleared from the streets, many young people are in a state of despair. They're anxious about their futures - from unaffordable housing and wealth inequality to the growing influence of Mainland China. Airin believes their defiant stunts can inspire others to stand up against powerful elites. Will they mobilise Hong Kongers to fight for change, or just land themselves in a lot of trouble