A liquid nitrogen leak in the laboratory has plunged the school into chaos. As Atlas and Zeynep are rushed to the hospital—hovering on the thin line between life and death—a desperate vigil begins for those left behind. Feza, who locked Zeynep and Atlas inside the laboratory, is forced to confront the torment of her conscience and her own fear. Determined to restore discipline to the school, Ms. Zümrüt decides to expel Feza and refuses to back down from her decision. Meanwhile, both the Black Cobras and the Swallows identify Feza as the primary culprit behind the incident. Thanks to Yiğit Efe’s keen observation and intellect, the mystery behind the terrifying meteorological phenomena—which have gripped the city and brought daily life to a standstill—is finally solved. Fatih and Yiğit Efe realize the connection between these natural disasters and the "Stone Gate." Father and son must now embark on a highly perilous operation in an attempt to halt the unfolding catastrophe.