Marco Buratti, known as the Alligator, is a former blues singer. Unjustly sentenced to seven years in prison, he lost his voice behind bars, but acquired the right knowledge to become an investigator.
Wanrak, an investigator, gets transferred to her small hometown in order to investigate the homicide of Chankrapor who was murdered and buried underneath a Chan por tree.
There, she meets the forensics doctor of the area who, although he likes to question her intelligence, teams up with her in order to find the murderer. Joining them is Trichai, a handsome young lieutenant who's always ready to help.
A fuel smuggler in southern Iran, who has been reprimanded and criticized by the others after the death of his comrade in a car accident, embarks on a one-man journey to seek revenge after finding clues to his comrade's murder. Ghasem Chakal is a young fuel smuggler in in southern Iran, who has been reprimanded and criticized by the others after the death of his comrade (Hamzeh) in a car accident. He also feels guilty and can not forgive himself, but when he finds clues that indicate his friend has been killed he embarks on a one-man journey to seek revenge. He makes a list of people who may have been motivated to kill Hamzeh and he goes to visit them with all violence, one by one.
Iraj and Hamid, old friends from their childhood, have a headache to pursue criminal cases, their foot is unintentionally opened to the case of serial murders... a case that they enter becomes pregnant with more dangerous events, but...
Viktor Vetrov, a successful businessman, is accused by a mysterious blackmailer of murdering his wife. His life turns into hell: his business collapses, his friends betray him, and the investigative authorities are desperately digging the earth, trying to find at least some evidence and send Vetrov to jail. The only person who took Victor’s side was his former lover, Investigative Committee investigator Inga Alme. But over time, she begins to doubt the man’s innocence when she learns that his first wife, Tatyana, also mysteriously disappeared many years ago. Both of Victor's wives are soon found dead. The handwriting of the crimes exactly matches the handwriting of the “Kuntsevo Ripper”, whom all the security forces in Moscow have been searching in vain for many years.
Police Major Vasilisa Zhuravlyova lives and serves in a small town. There are practically no serious criminal incidents here, and Vasilisa knows all the local lawbreakers by heart. However, the peace of this quiet place is disturbed by a murder that turns the lives of the townspeople upside down, revealing the secrets of the past. Vasilisa does not even imagine that the investigation will affect her entire close circle. And most importantly, it will put her before a difficult choice - to make public the terrible truth that has been revealed or to maintain peace in the city and her family.
Undercover Special Operations features several intelligence tasks (undercover) to fight crime. Each episode will feature different criminal cases. Among them, criminal cases involving teenage gangs, drug trafficking cases among school students, car buying and selling fraud syndicates, prostitution cases and drug mules among college students and others.