Esenya and Meglin travel to Nizhny Novgorod to investigate a serial killer who poses corpses of young women with flowers. Meglin reveals a part of his past to Esenya.
Meglin is determined to kill the murderer set loose by Esenya's father. He also takes Esenya to a "backup copy" of his archive, where she learns the truth about her mother.
Esenya and Meglin investigate a series of particularly gruesome murders. It seems that the killer murders people he deems guilty, using their "sins" against them.
Esenya and Meglin investigate a killer setting his victims on fire. Esenya meets with a woman she believes may know something about Meglin's past. She also confronts her father.
Esenya and Meglin investigate the death of a young woman whose naked body was found hanged. The clues lead them to the faculty of psychology at a local university. Meglin's illness becomes more and more serious.
When Esenya discovers a surprisingly high number of missing children in the town of Mikhaylovsk, she asks Meglin to accompany her there and investigate. The clues lead them to a local hiking club.
In Zaslavsk, a teenager goes on a killing spree in his school. After being surrounded by the police, he says he won't talk with anyone but Meglin. Meglin remembers his past.
Esenya and Meglin investigate a dead child. Zhenya asks Meglin for help with a possible serial killer of old women. Sasha is trying to find the man responsible for Anya's death. Esenya's father wants Meglin to stop working with her.