After explosive leaks from an offshore firm last year, others in the sector insisted it was a bad apple.
Now that claim can be tested.
A huge new leak of financial documents has revealed how the powerful and ultra-wealthy, including the Queen's private estate, secretly invest vast amounts of cash in offshore tax havens.
Donald Trump's commerce secretary is shown to have a stake in a firm dealing with Russians sanctioned by the US.
The leak, dubbed the Paradise Papers, contains 13.4m documents, mostly from one leading firm in offshore finance.
BBC Panorama is part of nearly 100 media groups investigating the papers.
How is the Queen involved?
Read the full story at http://www.bbc.com/news/uk-41876942