Shutter Island has one of those twist endings with a major revelation. Leonardo DiCaprio plays Teddy Daniels, a detective investigating the whereabouts of a missing patient. In the movie ending, the plot twist will have moviegoers reflecting back to the beginning, middle, and then to the end again.
Detective Daniels is dispatched out to Shutter Island to investigate a missing patient. The missing female patient tells Daniles there are unauthorized experiments going on at Shutter Island.
In the Shutter Island twist ending, Dr. Cawley (Ben Kingsley) informs Teddy he killed his wife after she murdered his children. It is an accident that leaves his mind crazy. Teddy refuses to believe, though he finally remembers the moment he comes home to find his children laying on the grass dead.
His wife Dolores is acting as if nothing happened. After Teddy attempts to resuscitate his children, he eventually loses it and accidentally kills his wife in the process. Teddy creates a fantasy world in his mind to suppress the traumatic experience which institutionalized him.
Chuck Aule (Mark Ruffalo) is supposedly Teddy's partner. The two are viewed as U.S. Marshalls. However, Chuck is a physician at Shutter Island. In the final scene, Teddy continues to believe he is a U.S. Marshall instead of an ailing patient. Dr. Cawley authorizes a lobotomy to free his mind.
Shutter Island twist ending conveys an imaginary world devised to suppress horrible memories. The movie ending explains the entire plot with clever tricks throughout the story. Shutter Island executes the the best twist ending to reveal the truth of Teddy's state of being. Great twist ending!