Coldcase - The secret of lost golden room

Are you ready for the become a Sherlock Holmes?
Cold Case is a detective's journey unraveling the mystery in the Winchester
house in Letland, Belle époque era, fictional country.
One day, a detective got a case seeking a girl named "Rura." The girl Rura
was the only heiress of the Winchester count in the Chadwick region. She
was disappeared 50 years ago with a Golden Room key.
With your time-traveling ability, back to 50 years ago to figure out what
was happened to the girl Rura and the Golden Room.
Get a clue by the unknown objects, puzzles, and the people in the house
that seem suspicious, including families. To solve the case, you must
combine the clues you got.
We implement various gimmicks in 8 different places to solve the case.
Depends on combining clues, the players will experience nine different
endings related to the Golden Room.