Use it to enter the inn and go to your room.
You turn in for the night and objects begin to scarily move around. The innkeepers are tricking you. Take the violin and use it at the old house next door.
i think you'll have to go back to your base, it depends on which level your on
you give it to the man who wants a room
There is this guy by the shore once you get your ghost hunting devices. Give him your hotel room key and hey will give you his boat key. Use it to travel to the lighthouse. :-)
you go to the inn and go to room 1b and when you get into the room you click the bed and then you go to sleep when you go to sleep the things in the room will start to shake
Go to the cemetery and offer to help the guy there. Get the records of his uncle's grave from the book at the newspaper office (in the cellar). The guy leaves town and you will receive the room key.
get the key from the guy who wants to know where someone was buried find out where the the persons buried by going and checking the files in the archives in the hemlock herald
Go to the inn and go to your room. You turn in for the night and objects begin to scarily move around. The innkeepers are tricking you. Take the violin and use it at the old house next door. Later you give your room key to a man who arrives on a boat.
you get the key in the forbidden forest which is down the sewer and up again and the you go far left then you see a key which has a number 8 on it that key is for stall 8. please improve my answer.
The prison is on another island a ways away from fionas house a guy will dock up on the shore after you look at the news paper you give him the key to the inn room B and you can use the boat just row to the prison and enter. but i warn you finding it may be hard.
Go left to the entrance to the Cemetery, and talk to the young guy looking for his uncle's grave. Get the information and go to look up the site at the obituary archives at the Hemlock Herald (go down to the basement). Look up the grave site, then return to the Cemetery. The guy gives you his room key for the Inn (room 2B).
In the supply room
there is a key, you have to click "use" and it will open.