Diary

The narrative moves between present-day police work and events from sixteen years earlier, anchored by a leap-year motif. A supernatural bus journey reveals how past crimes echo into the present, with events retold across two timelines and culminating in a revelation that bridges years.

The film largely unfolds in the hill town of Ooty, with its misty tea estates and winding ghats setting the mood for a haunting investigation. The prologue follows travelers along the famous Ooty–Coimbatore ghat roads, past the notorious 13th hairpin bend. The present-day action shifts to the Ooty police station and the surrounding Nilgiris district as Varadhan reopens an old case, eventually tracing clues through Coimbatore and other towns.

👻 Supernatural

The story layers a crime thriller with a ghostly presence, where the crashed bus and its wandering passengers return as spirits tied to an unsolved murder. The Bus 375 legend frames the investigation, making the haunting a driver of truth rather than mere fear. Ghosts appear as witnesses and catalysts, blurring the line between memory and reality. The theme asks what justice means when the dead still navigate the living world.

🔎 Investigation

Varadhan’s pursuit relies on careful detective work: interviews, cross-jurisdictional checks, and piecing together a killer’s modus operandi from years past. The film emphasizes perseverance, rational inquiry, and the unveiling of a long-hidden conspiracy led by a powerful antagonist. It shows how evidence, not superstition, ultimately resolves the case and brings the guilty to account.

⏳ Time & Fate

Time is cyclical: the 13th hairpin bend, the leap year, and the bus that returns in a new form every four years. The past continuously intrudes on the present, shaping Varadhan’s choices and his future with Pavithra. The narrative uses time as a moral force, suggesting that unresolved acts cast long shadows that demand reckoning.