When the stories from a crime novel begin to get recreated in the city, Vikram Kumar, an astute undercover police officer steps in to investigate a bizarre missing case and unravel the mystery.

Tharunam follows the journey of Arjun, a dedicated CRPF officer, and Meera, a driven entrepreneur, whose paths cross at a chance encounter. As their relationship begins to evolve, the story delves into the emotional and personal challenges they face together. With each moment pushing them to new heights, Arjun and Meera navigate the complexities of their bond, learning from their struggles and triumphs. The plot explores how their growing connection shapes their lives and how they overcome the obstacles that come their way.

When the daughter of a state DGP goes missing, it aligns with a crime novelist's story prediction. Now, an undercover cop is brought in to solve the enigmatic puzzle.