While investigators first suspect a street robbery, Dr. Panov discovers evidence suggesting two perpetrators were involved. During the search, a bag of drugs is found in Rozanov's car, but Maria Shvetsova remains convinced they were planted.

The season consists of 16 episodes, divided into 8 distinct two-part films.

Anna Kovalchuk returns as Senior Investigator Maria Shvetsova. If you'd like to dive deeper, I can look for: The identities of the real killers in the "Potion" case. A summary of the next film , "The Partner." Current streaming links or where to watch the full season.

The season opens with the murder of a young man named Sergey Rozanov, who is stabbed to death outside his home.