Mr Bates vs The Post Office so outraged a nation that within days of airing, it forced the Prime Minister to change the law to right the damage done. The series tells the extraordinary story of the greatest miscarriage of justice in British legal history, created with direct input from the innocent - and indomitable - people caught up in it. When money started to disappear from its local branches, the Post Office wrongly blamed their own sub-postmasters for its loss. For more than a decade, hundreds were accused of theft and fraud, and hundreds were sent to prison. Lives, marriages, and reputations were left in ruins. But the issue was actually caused by errors in the Post Office's own computer system - something it denied for years. Revealing a shocking David vs Goliath fight for justice, this is the story of the decent ordinary people who were relentlessly pursued, intimidated and punished by a powerful corporation; and their ongoing battle, against seemingly insurmountable odds, to right so many horrific wrongs.