The Great Post Office Trial is a sober BBC investigation of the Horizon scandal, told through people, documents, and the slow exposure of institutional conduct. It begins with sub-postmasters whose lives were damaged by prosecutions and accusations based on computer data the Post Office said could not be wrong. The stories are often devastating. Wendy Buffery describes conviction, isolation, and suicidal despair before contact from Jo Hamilton interrupts that loneliness. Seema Misra’s case sits near the beginning of the reporting history, recalled through Devinder Misra’s effort to get someone to pay attention. Parmod Kalia appears as someone still waiting for justice while facing serious ill health. The programme gives victims room to speak, but it does not leave their testimony floating without context. Nick Wallace repeatedly turns from personal damage to memos, legal advice, inquiry evidence, and institutional decisions. That structure gives the show its force. It is not content to say the Post Office failed; it asks who knew what, what they were shown, what they disclosed, and what they chose to prioritise. Recent episodes examine unsafe convictions, compensation schemes, the Clarke advice, Second Sight, and the role of senior leadership. They also address a Post Office security compliance document that used racist classification language and raise the question of whether racism influenced prosecution decisions. Paula Vennells’ inquiry evidence is tested against emails and warnings about Horizon, past prosecutions, and media management. Nick Reid’s interview is used to press the Post Office on disclosure, culture, and accountability. The show’s pacing is deliberate. It trusts listeners to sit with legal language, procedural failures, and uncomfortable silences. Its most memorable moments often come when a calm question meets an evasive or damning answer. The wider arc is a reckoning for the Post Office, the legal system, government oversight, and a society that took too long to listen. For all its gravity, the series also records persistence: campaigners, lawyers, investigators, and former sub-postmasters forcing names into the record and evidence into public view.