Saikawa and Nishinosono return to the camp, putting off trying to find a solution to the case. But they can't stop thinking about it. They go back to the lab and investigate Dr. Shiki's rooms again, where they find a strange number that is a clue.
The other two lived inside her head.
.الاثنان الآخران كانا داخل عقلها
Die anderen beiden
waren nur in ihrem Kopf.
Las otras dos vivían dentro de su cabeza.
Las otras dos vivían dentro de su cabeza.
Les deux autres
étaient dans sa tête.
Gli altri due erano nella sua mente.
Os outros dois estavam 
dentro da mente da Doutora.