
Rajathanthiram: The Piano(2023)
The story revolves around a special piano that holds a precious secret. Many years ago, a man by the name of Arumugam receives a wooden box as a gift from an anonymous Englishmen for his kindness. Upon inspecting the wooden box further in his house, Arumugam discovered a precious pink diamond, with no intention of selling the diamond, he and his piano-maker friend designed and built a custom-made piano that has a secret compartment that can only be unlocked by playing a unique tune. Arumugam splits the tune into four and teaches his four children separately. Years passed and Arumugam develops Alzheimer's disease, forgetting about the piano's secret, neither does his family had any knowledge of it but things started to go for the worse when several dangerous and mysterious figures finds out the piano's secret and goes after Arumugam's family for the diamond.
Quick Facts
- Theatrical Release
- 29 June 2023
- Director
- Sakthi Chidambaram
- Language
- Tamil
- Runtime
- 2h 11m
- Rating
- 10.0/10
Storyline
A man hides a valuable pink diamond inside a custom piano, locking it with a special tune. He teaches each part of the tune to one of his four children. Years later, after he forgets the secret, dangerous people learn about the diamond and target his family to get it.
“A forgotten melody holds a priceless secret.”
Film Details
Parental Guide
Vibe & Tags
Cast & Crew

Trivia
- The film's director, Sakthi Chidambaram, is the son of veteran director K. Bhagyaraj, making this a second-generation directorial venture.
- The central prop, the custom-made piano, was specially constructed for the film by artisans to ensure it could practically house the secret compartment shown on screen.
- Actor M. S. Bhaskar, who plays the older Arumugam, reportedly studied the mannerisms of individuals with Alzheimer's to prepare for his role.
- The film's title, 'Rajathanthiram', translates to 'King's Jewel' in English, directly hinting at the precious diamond plot.
- This was one of the few 2023 Tamil films to blend a family drama structure with a mystery thriller centered on a musical instrument.
- The plot device of splitting a musical tune among multiple family members is a narrative technique reminiscent of classic treasure hunt stories.