'Hello. This is John Doe. Interested in data? I'm happy to share.' We talk to the two journalists who got the Panama Papers scoop, Bastian Obermayer and Frederik Obermaier who've written a book about their experience. Plus: what does Brexit mean for tax justice? We discuss the F4 (unholy) alliance between Switzerland, Hong Kong, Singapore and the UK, and the accelerated corporate tax race to the bottom.