Entertainment Software Ratings Board website (and Australia's OFLC as well), just like our man Leo strolled off that boat in the film upon which the game is based. While the Aussie board description only reveals that the game is being published by City Interactive, the ESRB description details it as a "seek-and-find puzzle" (read: hidden object) game.
Players will take on the role of US Marshals exploring the movie's Shutter Island location where the "Ashecliffe Hospital for the Criminally Insane" is housed. Aside from finding "clues/items among scenes of jumbled objects," players will interview hospital personnel and uncover patient files -- one of which is said to have a story about "the scalping of relatives for use as hats." So, not for kids then?