Riddle in the Mist

"Now that you know the existence of this cursed group we will not let you go anywhere"
As Iris reaches the right age for her to be able to have her freedom to go outside their mansion and explore the vast world where she live. At the same time her brother whom she respected and love was killed during her birthday. Things begun to turn upside down as she tried to know who is responsible for the death of her brother, with the pocket watch and the book as her clue.