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.
No one should have been able to enter or leave.
.لا يُفترَض أن يتمكّن أحدٌ من الدخول أو الخروج
Da kann eigentlich niemand
Nadie pudo haber entrado o salido.
Nadie pudo haber entrado o salido.
Personne n’aurait dû pouvoir
y entrer ou en sortir.
Nessuno poteva entrare o uscire.
Era impossível para qualquer pessoa
 entrar ou sair dele livremente.