Young warrior Vandiyathevan is rushing toward Thanjore, bearing an extremely crucial secret message in palm-leaf manuscript (Olai) from Aditha Karikalan-a message that holds the key to the Chola Empire's destiny.

An unexpected storm forces him to take refuge in a mysterious Public rest house (sathiram), rife with secrets. A sudden, unexplained death occurs there, framing him for the murder and ensnaring him in a dangerous web of his enemies' conspiracy.

This story is the account of his fierce, thrilling investigation to uncover the true killer, save his life, and finally deliver his critical mission.