This is a very dark and thought provoking psychological thriller with some degree of horror elements that surround it. The acting was great, really gave the movie a realistic, emotional edge - relating to the atmosphere and the disturbing tension this film contains throughout. DiCaprio brings everything he's got to the table when he acts, and he definitely did in this one. Shutter Island is about Teddy Daniels, a man accompanied with his officer to go and investigate a psychiatric ward and other asylums on an island, where he begins to experience episodes and sudden flashbacks of his estranged wife. Let me say that the plot and story takes a major twist and turn halfway through the film which was definitely shocking, which changes your point of view completely. Shutter Island is not for the faint-hearted; it contains highly disturbing and creepy imagery, especially by Teddy Daniel's realistic and unrelenting nightmares - one shows a woman covered in blood, a graphic shooting at a WW!! camp, frozen corpses, drowned children, and his wife turning into ashes. The asylum patients behavior and appearance can be quite disturbing, including the interviews where some discuss their horrific crimes in detail. The language isn't pervasive, but strong and crude (uses of f**k, godd**n, sh*t, c**k). There's some drug use - some characters smoke and use pipes, the usage of psychiatric drugs and sedatives, and some discussions about alcohol abuse. Nevertheless, Shutter Island is truly a thought-provoking and compelling thriller with masterful acting and with a plot full of shocking twists and surprises. Mature older teens should be ok with this film.