Having found and interviewed Caleb, our theory of the case is developing – and we think the FBI and police were wrong. As we close in on our last remaining suspect, we hear from people from his past. They paint a deeply disturbing picture. But will we be able to track him down? Will he agree to speak to us? And will we be able to find the answers we seek? Who is Magnus Diridian – and is he the perpetrator of the attack? It’s time to find and confront our suspect.

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