Japan's Masayoshi Son has made and lost several fortunes, investing or controlling assets worth $1trn in the past two decades through his media-tech giant, SoftBank. He bankrolled Alibaba, China's internet colossus, before the world had heard about it; plotted with Steve Jobs to turn the iPhone into a wonder product; and financed hundreds of tech start-ups, fuelling the biggest boom Silicon Valley has ever seen. This book takes you on Masa's wild ride, from his birthplace in a Korean slum in post-war Japan to the modern-day temples of power.