Haunted Hotel: Charles Dexter Ward

Your twin brother is missing and the only clue you have to work from is an address to a hotel that he left behind! The only trace to follow is the necklace he never took off...and a swampland address. Now, you must navigate through a winding tangled swamp in order to find him! Follow the clues James Spillet left and discover an awful truth. The clues lead you to an abandoned hotel where you unravel a mystery of necromancy and more in this eerie hidden-object puzzle adventure classic! Wield the powerful incantations of the Necronomicon and save your brother! Seek out clues and useful, hidden tools to solve cunning puzzles left by a diabolical madman!

Source: The Developer Website.