The protagonist in question is Arron Banks, the most important funder of both the pro-Brexit UK Independence Party (UKIP) and Leave.EU, one of several organizations that campaigned to get Britain out of the European Union. By the relatively low-spending standards of British politics, Banks was a huge donor, giving $11 million of his own money to the Brexit cause and raising an additional $5 million on top. And here's the peculiarly British part of the story: Thanks to Banks's extensive use of tax havens and shell companies, it has never been entirely clear where all of that money came from — or even whether all of it was really his.

Some of it, he says, comes from an insurance company he owns. Some comes, supposedly, from “diamond mines.” All of it is spread among dozens of companies based in Gibraltar, the British Virgin Islands and the Isle of Man, according to documents revealed in the Panama Papers, among other things, as well as Britain. Although he has testified that none of the money used in funding the campaign came from foreign sources — which would be illegal — the British electoral commission found his stories suspicious enough to ask the National Crime Agency to investigate.

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Banks also seems to have been very friendly with some foreigners who also believed that Brexit was in their national interest. Last summer, the Guardian reported that the Russian ambassador to Britain had offered him a tantalizing and peculiarly lucrative investment in Russian gold mines; Banks declared categorically that he would never invest in Russia: “No. Flat. Zero. Nothing,” he replied in an interview with ITV News. This week the broadcaster’s reporters alleged that a finance company substantially owned by Banks did pursue the deal — and even identified a shell company, based in Sweden, that could be used to pursue it. Because Banks still denies that the deal happened, and because the story is so hard to follow further, we won’t know the truth before March 29, when Britain is scheduled to leave the E.U.

But even if this story won’t delay Brexit, it does firmly locate the referendum within a larger context. The truth is that Britain has become a place where untransparent money, from unknown sources, is widely accepted with a complacent shrug. London is the world capital of offshore banking, home to the most sophisticated accountants and lawyers; a third of British billionaires have availed themselves of those services and moved their money beyond the reach of the state, according to a report Thursday in the Times of London. Many of them nevertheless continue to make donations to British political parties, and many continue to lobby to keep the rules that favor them exactly as they are.

As a result, the British political class does not have the willpower to force them to bring their money home. The British state does not have the legal tools to force Banks to show where his cash came from. The British media continue to investigate, but if anyone were trying to influence the British referendum campaign from outside the country — beyond the social media manipulation that is now de rigueur in almost every election — it’s possible that we’ll never know.

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And here’s the final irony: If Brexit was the creation, in part, of this new world of offshore money and political influence campaigns, Brexit may well ensure that it continues unrestricted. The E.U. is probably the only power in Europe — maybe even the only one in the world — with the regulatory strength to change the culture of tax avoidance. And since 2016, it has been slowly enacting rules designed to do exactly that. Britain, once it leaves the E.U., may well be exempt.

British industry might suffer after Brexit, and British power will be reduced. But the gray zone — where politics meets money, where foreign money can become domestic, where assets can be hidden and connections concealed — will survive. Perhaps that was the point all along.