- A gifted musician inherits a mansion after her long lost father dies under mysterious circumstances. She discovers his last musical masterpiece riddled with cryptic symbols that unravels an evil secret.
- After being informed of the sudden death of her long lost composer father, a young virtuoso violinist, Rose Fisher (Freya Tingley), inherits an old mansion in which he used to live. There, she discovers her father's final work: a mysterious music score marked with strange symbols. With the help of Charles Vernais (Simon Abkarian), her agent and manager, she deciphers the symbols and, little by little, starts to unlock secrets concerning her father's past, setting in motion the mechanisms of a somber plan imagined since the day she was born. They soon discover that there's more to the sonata in question than meets the eye which, when played, triggers and unleashes dark and terrifying forces.—Happy_Evil_Dude
- Violin virtuoso Rose Fisher and her agent Charles Vernais learn Rose's estranged father committed suicide by setting himself on fire. Charles is shocked to discover Rose's father was Richard Marlowe, a celebrated composer who notoriously turned into an eccentric recluse. Rose and Charles fight over their strained professional relationship when Rose decides to postpone her commitments in order to visit the remote French estate she inherited from her father.
At Marlowe's mansion, Rose briefly meets her father's former housekeeper Therese. When she goes into town to buy cigarettes later, store patrons stare strangely at Rose upon learning who her father was.
Rose finds sheet music for a seemingly unfinished violin sonata locked inside her father's desk. Rose notices strange occult symbols on the pages. A demonic shape briefly appears behind Rose when she plays part of the music on a piano.
Rose calls Charles to apologize. She also tells Charles about the sonata and sends him pictures of the pages to see if he can make sense of the symbols.
A haunting presence and childlike voice draw Rose back to the music room. Rose discovers a clock with a mark matching one of the sonata symbols.
Recognizing the sonata as Marlowe's final masterpiece, Charles shows the piece to former client and musical prodigy James. James observes that the music is barely coherent in certain places. Unable to decipher the score further, James refers Charles to music historian Sir Victor Ferdinand, who used to work with Marlowe.
After examining the pages, Victor shows Charles a book on occult history. Victor links the strange symbols to a French secret society that believed music allowed mortals to communicate with the devil and that they could conjure the antichrist by using music to open an otherworldly portal. Charles begins suffering from intermittent headaches after Victor plays a portion of the score on his piano.
Rose finds a collection of newspaper clippings about her musical success that Marlowe kept. She also finds one of the occult symbols etched inside the fireplace when the flames burn hot. Rose then suffers from a nightmarish vision in which her burning father points toward a living statue of two cherubs outside.
Charles arrives at the estate. Charles tells Rose about the French secret sect by identifying the four symbols as representing the four faces of evil: power, immortality, appearance, and duality. Together they form a fifth symbol of evil, which is also the symbol of the occult order.
Rose shows Charles the symbols she found on the clock and in the fireplace. From those clues, Rose and Charles heat the sheet music, which reveals hidden music notes. They also conclude that the score must be played out of time since Marlowe's clock was an hour behind.
At Rose's suggestion, Charles meets with Therese to find out if Marlowe's housekeeper saw any other symbols inside the mansion. Therese mentions seeing one of the symbols behind a mirror, spurring Charles to conclude the music must be played backwards. Therese also mentions that Marlowe used to disappear into the woods for long periods of time and that townspeople suspected him in the disappearances of local children.
Rose finds an old chapel hidden in the woods. Stairs lead Rose to an underground chamber where she discovers a mural depicting a demon, torture tools, and audio tapes of Marlowe murdering children to record their specific screams.
Rose encounters several ghost children in the forest on her way back to the mansion. Rose tells Charles what she found. With Charles growing increasingly insistent about decoding the sonata, Rose shows him the duality symbol discovered earlier on the cherub twin statue outside. The clue reveals that the sheet music pages must be overlaid on top of each other.
Charles finds the fifth and final symbol painted into a rose on a portrait of Marlowe. With the sonata deciphered, Charles explains that Marlowe wrote the score specifically for his daughter Rose because he needed her pure soul to play the piece, which was partly composed from the kidnapped children's screams.
Determining the music to be evil, Rose goes to burn the pages and call the police. Overcome with obsession, Charles chokes Rose before forcing her to play the sonata.
Rose's eyes begin glowing as she plays her violin. Four ghost children materialize in the room. A demonic entity appears and kills Charles. The windows shatter when Rose plays the final note. Therese finds Charles' dead body the next day.
Some time later at the Royal London Concert Hall, Victor attends a recital featuring Rose. Rose's eyes glow from possession as she begins playing the sonata in front of an audience. (thanks to culturecrypt)
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