https://store.steampowered.com/app/1104830/Mystery_Masterpiece_The_Moonstone/
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STEAM KEY REGION FREE GLOBAL

A thrilling hidden object whodunnit... Who stole the Moonstone diamond? Is it cursed? It’s up to you to investigate and unravel the mystery! Investigate every person who was in the Victorian mansion at the time of the crime to locate the thief and try and find the ancient jewel in this hidden object adventure! Play the role of Detective Cuff, exploring every room to find valuable clues and hopefully return the enormous diamond to its rightful owner.