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Main characters and their mini-biographies:

Galina Rogozina — Colonel, Doctor of Medical Sciences, Head of the FES. A widow who lost her husband in Chechnya, she has dedicated her entire life to the laboratory. She prefers to keep her distance from her subordinates, but after interacting with her, FES employees are ready to work without weekends or lunch breaks.

Nikolai Kruglov — Major, Rogozina's deputy. He does not participate in laboratory research, preferring to work at the crime scene and take part in interrogations. He is a tough man with his own vision of the job and is ready to defend it.

Ruslan Sultanov — Major General, founder of the FES, curator of the service.
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Operatives
Sergey Maysky — Major of the GRU Special Forces, senior operative.

Konstantin Kotov — Captain of the militia/police, operative. Hot-tempered, he can be overly aggressive during interrogations.

Konstantin Lisitsyn — Major of the militia/police, senior operative. An expert in his field, he excels at fieldwork and interrogating suspects.

Yulia Sokolova — Police Major, FES employee. Proficient in all types of firearms and many forms of combat. Responsible and decisive in her work, a loyal comrade.

Experts
Ivan Tikhonov — Head of the FES computer department, programmer, biologist, hacker. Capable of tracking the location of any electronic device and hacking any secured system.

Oksana Amelina — Programmer, Senior Police Lieutenant. She has become a "broad-profile" expert — capable of conducting almost any examination, from chemical-biological research to traceology and ballistics.

Valentina Antonova — Forensic expert, pathologist. Capable of establishing the time and circumstances of death "to the second," and, due to her analytical skills, can suggest the causes as well.