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 living space was carefully cleaned.
.مساحة المعيشة كانت مُنظفة بدقة
Ein gesäuberter Wohnraum.
Su espacio de residencia estaba impecable.
Su espacio de residencia estaba impecable.
Un espace de vie si bien nettoyé…
Uma residência que foi 
meticulosamente arrumada.