U.S. President Donald Trump (left) and Russian President Vladimir Putin (right) shake hands before a meeting in Helsinki, on July 16, 2018. | BRENDAN SMIALOWSKI/AFP/Getty Images)

In this three-part series, "Four Corners" delivers a riveting account of the allegations and evidence from the characters central to the drama that has gripped the world. Months in the making, filmed across the United States, the United Kingdom and Russia, Sarah Ferguson charts the extraordinary allegations, interrogating the evidence and interviewing central characters in this unfolding story that could be lifted from the pages of a blockbuster spy novel.

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