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INVESTIGATION: THE BEGINNING
Akash Sakthivel is a happy and loving middle-class employee working in a workshop of his brother's friend Karan in Ambasamudhram.

He has a loving sister-in-law Durga and brother Chandra, who is ready to do anything for him. He is an advocate in the District Court of Tirunelveli.

Akash Shakthivel's marriage is arranged with Jessica George after making peaceful talks with his brother Joseph who was initially against their marriage due to the difference of religion. Akash's close friend Arun Kanthavel is a police officer in CID and a close friend from his childhood and he has come to meet him.

All was going well until Jessica is kidnapped mysteriously and then being, killed mysteriously. This shatters Akash and Jessica's brother, who requests Akash to get justice for her death if he loves her truly, which he accepts gladly.

Later, an ID card holding Akash as a CID officer is accidentally taken by his sister-in-law and upon being confronted by her, he reveals to her about the trip that he had gone to Dehradun before 3 years.

He had lied to his brother he goes to Dehradun for a trip but goes there for being trained as an IPS officer in CID where Arun has also come for training. Akash is posted as an officer undercover to observe Karan, his brother's friend but, a criminal in illegal activities despite having a workshop and his brother becomes shocked after hearing Akash's job since he also works with Karan's brother as an advocate who is, in turn, a political activist.

Keerthika is a girl from a rich background whose only world is her family and she has an elder sister and a younger sister. Her elder sister works as an Agent in the Detective department while Keerthika works as a successful surgeon in her father's hospital.

Later, Keerthika's father Dinakaran is investigated by Akash about Jessica's murder since she was working in his lab as a microbiologist. But, he refuses to tell any clues and instead requests for protection to his family due to the interrogation made by his department. He accepts his request and gives tight security to his house and hospital. Akash also officially takes charge as ACP of Tirunelveli to investigate the case by himself further.



Keerthika and Akash have a misunderstanding initially when he worked in the workshop of Karan. But, they become good friends later. Now, Akash has to face many hurdles from ACP Fernando George, a crime branch police officer...