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4. Navigating the Matrix

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 15 mins

Parts 1-5

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 57 mins

5. Follow the Money

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 15 mins

6. War of Attrition

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 19 mins

7. A Call for Help

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 16 mins

8. The Big Green Button

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 15 mins

9. Extremely Aggressive Litigation

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 14 mins

Parts 6-10

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 57 mins

10. What the Hell Had Happened?

The extraordinary story of a campaign to uncover a massive scandal at the Post Office.

• 15 mins

11. The Reckoning

Nick Wallis provides an update on the Post Office scandal, with startling new details.

• 28 mins

12. Nowhere Near Over

Nick Wallis continues his investigation into the Post Office Horizon scandal.

• 28 mins

Bonus Episode: The Full Nick Read Interview

The Post Office CEO addresses allegations about bonuses, racism and compensation.

• 30 mins

13. Inside the Machine

New documents reveal chaos as Horizon is built and commissioned.

• 14 mins

14. The Prosecution Spree

Horizon is rolled out - and prosecutions on its data begin in earnest.

• 14 mins

15. Breaking Lee Castleton

A postmaster fights back, and pays the price.

• 14 mins

16. Closed Ranks

Facing pressure, the Post Office finds ways to defend itself.

• 14 mins

17. Facing the Music

Flawed prosecutions are exposed, and an active cover up begins.

• 14 mins