Shutter Island (Martin Scorsese, 2010)

Leonardo DiCaprio might have been well advised to leave some space between this and Inception, since it's clear early on in both that his character is beginning to doubt his own sanity. He's in danger of becoming a rent-a-breakdown. But then, given the menace that Scorsese hits you with from the start, and Ben Kingsley as a psychiatrist, you can hardly expect anything other than tears.
This time, DiCaprio plays a federal marshal charged with investigating a disappearance on an asylum island. He's hit from the outset with migraines and unsettling visions of his dead wife, and things can only deteriorate from there, with Kingsley and the wardens of the facility dropping increasingly provocative hints.
The whole owes a rather large debt to Samuel Fuller's seminal Shock Corridor, in which an investigative journalist undercover at a mental asylum loses his grip on reality, and so the eventual twist, heavily signposted, hardly raises an eyebrow. But this being Scorsese, the execution is of sufficient quality that you'll still keep watching until the denouement.

6/10