Shutter Island

It's September 1954. U.S. Marshal Teddy Daniels and his new partner, Chuck Aule, take a boat out to Shutter Island, home to Ashecliffe Hospital — a high-security institution for the criminally insane, built on a remote outcrop off the coast of Massachusetts. They've come to investigate an impossible disappearance: Rachel Solando, a patient committed after drowning her own three children, has vanished from a locked room, seemingly through a wall.

As Teddy questions the hospital's staff, he senses something is being hidden from him. Migraines blur his vision, and the watchful doctors give careful, evasive answers. Teddy admits to Chuck that he has a second reason for taking the case: he believes a man named Andrew Laeddis — who he blames for a fire that killed his wife, Dolores — is being held somewhere on the island, and he intends to find him.

As a hurricane closes in and cuts the island off from the mainland, the case grows stranger. Teddy discovers a coded note hidden by another patient, and slips into a forbidden ward where he glimpses evidence that unsettles him deeply. He becomes convinced Ashecliffe is a front for something far worse: secret, dangerous experiments carried out on patients without their consent.

At the same time, Teddy's own mind seems to be turning against him. Splitting migraines bring on vivid, painful visions: memories of the day he and other American soldiers liberated a Nazi concentration camp near the end of the war, and images of his wife Dolores, soaked and grieving, appearing to speak to him. When Chuck vanishes during a climb across the cliffs, Teddy is left alone, increasingly disoriented, unsure who on the island he can still trust.

Teddy finally reaches the lighthouse he believes hides the hospital's darkest secret. Instead, he is met by Dr Cawley, who delivers a devastating truth: Teddy is not a marshal. He is Andrew Laeddis — a patient at Ashecliffe. Two years earlier, his wife Dolores, suffering from a severe mental illness the family had missed, took the lives of their three young children at their lake house. When Andrew found her, in his horror and grief, he shot her.

Unable to bear what he had done, Andrew's mind built an entire alternative story to hide from it: a heroic marshal called "Teddy Daniels," hunting a man called "Andrew Laeddis" for a crime that was really his own, investigating a missing patient called "Rachel Solando" — an anagram of his wife's name, Dolores Chanal. "Chuck," his partner throughout, was in reality his psychiatrist, Dr Sheehan, taking part in a last, radical form of therapy: letting Andrew act out his delusion in full, in the hope that living it through to its end might finally let him face the truth and avoid a lobotomy.

For a moment, Andrew seems to understand and accept it all. But the next morning, he speaks to Sheehan again as "Chuck," and the delusion appears to have reclaimed him. As orderlies lead him away — toward the lighthouse, and the operation that awaits him there — he turns and asks one last, quiet question about what kind of man he would rather be.

The American neurologist Walter Freeman developed a fast, brutal version of the operation in 1945: the transorbital lobotomy, performed by tapping a thin, pick-like instrument through the eye socket and into the brain — no operating theatre required. Freeman performed more than 3,000 such procedures between the 1930s and 1960s, and for years he was a celebrated, influential figure in American medicine. But by the mid-1950s, long-term studies were exposing how badly patients fared, and the arrival of drugs like Thorazine offered doctors a safer alternative. Freeman's reputation, and the lobotomy itself, declined rapidly. Shutter Island places its story at exactly this turning point — a hospital where the old, violent answer and the new, chemical one exist side by side.

The film's dread of secret, non-consensual experiments on the mind is not paranoid invention. In 1953, CIA director Allen Dulles approved a real, top-secret program known as MK-Ultra: for two decades, the agency tested LSD, hypnosis and sensory deprivation on subjects — sometimes without their knowledge or consent — searching for ways to control the human mind at the height of Cold War anxiety. The public only learned of it in 1975, through a congressional investigation.

That fear of doctors experimenting on people without consent has a darker, earlier root: the Nuremberg Code of 1947, written by American judges after the trial of Nazi physicians who had performed torturous, lethal experiments on concentration camp prisoners. It was the first major statement of the principle now central to all medical research — that a patient must give voluntary, informed consent. Andrew's flashbacks to liberating a concentration camp are grounded in a real event, too: on 29 April 1945, U.S. Army divisions liberated Dachau, freeing roughly 32,000 prisoners and discovering horrors that shocked the soldiers who found them.

One more honest detail: in 1954, what we now call PTSD had no settled diagnosis. It would not be formally recognised until 1980, when it entered the American Psychiatric Association's diagnostic manual, following research into Vietnam veterans and Holocaust survivors. Before that, the language available was older and cruder — "shell shock" from the First World War, "combat fatigue" from the Second — and, briefly, "gross stress reaction," added to the very first diagnostic manual in 1952 and then quietly dropped in 1968. A man like Andrew, carrying what he saw at war and the loss of his family, would have had almost no framework, and little real support, for what he was living through.