In Hong Kong harbour, Yoko Tsuno must face the most powerful creature in human legend: a dragon.Travelling to Hong Kong to visit the Chinese branch of her family, Yoko is attacked by a massive, lizard-like creature. She finds a string of scientific clues and evidence, but as the pragmatic electronics engineer's investigation progresses, the trail leads her to a mysterious little girl and fills her with a sense of wonder that will change her life forever.