In the final episode, Ceri travels to meet Rob in a peaceful garden in rural Wiltshire. What unfolds is a heated exchange about what Rob's story really is and what adds up to the whole truth.

Our next investigation: Three doors down launches on Tuesday 18th July. For the premium Tortoise listening experience, curated by our journalists, download the free Tortoise audio app. For early and ad-free access to Three doors down and our other investigative series, subscribe to Tortoise+ on Apple Podcasts.

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