Mifsud is one of several key figures among a complicated cast of characters shaping the Russia probe. In the spring of 2016, Mifsud told a young Trump campaign aide, George Papadopoulos, that Russia had “dirt” on Clinton in the form of “thousands of emails,” according to the special counsel’s statement of the offense against Papadopoulos, who was indicted for misleading federal agents about his conversations with Mifsud. Russia had hacked the Democratic National Committee months earlier, and would soon break into Clinton campaign chairman John Podesta’s inbox. It is still not clear how Mifsud seemed to know in advance that Russia sought to compromise Clinton’s candidacy.

The lawyer allegedly questioned by Mueller’s team, Stephan Roh, is a German multimillionaire with ties to Russia. He hired Mifsud as a “business-development consultant” in 2015, and is Mifsud’s “partner and best friend” and “the money behind him,” Papadopoulos’s wife, Simona Mangiante, who worked for Mifsud briefly, told me. Roh’s wife is Olga Roh, a Russian fashion designer who appeared on the British reality TV show Meet the Russians. He’s also in the nuclear-energy business: He acquired a small British nuclear consulting firm from scientist Dr. John Harbottle in 2005, according to the BBC, and invited Harbottle on an all-expenses paid trip to Moscow shortly thereafter, Harbottle told the outlet. Harbottle declined the offer because he “smelt a rat,” he said, and was then fired. Within three years, Severnvale Nuclear Services’ turnover went from under $100,000 to $44 million, per the BBC.