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.
we'll know who it was
سنعرف من الذي
wissen wir, wer in
jenem Zimmer war,
nous saurons enfin
qui était dans cette pièce…
sapremo anche chi si trovava
saberemos quem 
estava naquele quarto,