Mystery Locks: The Cabinet of Curiosities

Remember how eccentric your grandfather was? Always well-dressed and full of mysteries. He used to have his own cabinet upstairs, in the attic, where he stayed for hours, late into the night. You never got to enter, as he always told you that one day, you'll be invited in. But that day never came. You tried to forget his death, but one day the postman brought a letter addressed to you from... your grandfather!