BBC viewers can't stop watching Prisoner 951 , the new factual drama based on a heartbreaking true story that has left viewers "speechless". The four-parter charts the story of Nazanin Zaghari-Ratcliffe, a British-Iranian citizen, and her husband Richard Ratcliffe.

When Nazanin is imprisoned and held hostage by the Iranian government for six years, her husband launches an international campaign to secure her release. Starring Narges Rashidi and Joseph Fiennes, all four episodes are available to watch now on BBC iPlayer.

It's no surprise that viewers are hooked on this series. Not only is it based on the gripping true story that captured headlines and sparked a national conversation in British politics, but it also boasts standout performances from Narges Rashidi and Joseph Fiennes

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