What is the truth about Shutter Island?

The truth of the story in the movie "Shutter Island" is that Teddy, the male host, is the wife killer "Ledis" he has been looking for.

As a veteran returning from World War II, he was alienated from his wife and family because of the psychological trauma left by various wars, which eventually led to his wife dolores suffering from severe depression.

And one day, she personally killed herself and Lydia's three children. When she got home, she saw this scene. Heartbroken Lydia shot Dolores and burned down the house. After that, she became seriously insane and was sent to Shutter Island for treatment.

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The story happened in 1954. Federal Marshal Ted Daniel (Leonardo DiCaprio) and his new partner Chuck (Mark Ruffalo) were ordered to go to the island to investigate the matter. The competent doctor Cowley received them and was responsible for assisting the investigation.

Ted came here with a secret purpose: to find the murderer who killed his wife in the fire. During the investigation, more and more evidence proved Ted's inference: in addition to the 66 mental criminals with files, there was another person with the number 67, but no matter the prison guards, doctors or other patients denied it.