Alan and his friends meet Sam Kaur, due to stand trial and suffering mentally, and Michael Rudkin, who has inside knowledge of Horizon. Jo and Alan take their cause to James Arbuthnot MP in Westminster, who persuades the Post Office to hire an independent investigator. As Bob Rutherford starts work, he finds evidence of faults in the IT system, and becomes convinced of the honesty of the subpostmasters. Bob's explosive report rattles Post Office boss, Paula Vennells, who approaches Alan personally to find a solution. But can Alan trust Paula to pursue the truth at any cost?