Months after Jeremy first approached Basia, the team fly to Nairobi to sit down with the mysterious essay writer. And it turns out that he is not the only person ready to share what he knows about who killed Christopher Allen.

The team tries to understand the connection between Chris's trip to South Sudan, and one taken by a group of American fighters just weeks before. Could this explain why Chris was called a white rebel? And after months investigating, Basia finally speaks to the fighter who fascinated Chris, and she asks – how close really were you?

In the last episode of the series, the team finally hears from a man they've been chasing for months. And they return to Maine, to tell Christopher's parents what they have discovered about their son's life and death.