An old house in London on a bitterly cold night. In the house, a crowd of people are gathered, young and old, their rapt attention fixed on one man, Simon Puritan, a medium. A man who talks with the dead. Simon picks a husband and wife in the crowd and tells the husband that their deceased daughter is in the room with them. The husband is in shock as Simon tells him things that only he and his wife could know, delivering the husband a message from his daughter - a message of hope and love from the afterlife. The husband is a changed man; the pain in his eyes has vanished.
Later, in the now empty house, Simon meets the wife who pays him for the service he has just rendered. There was no daughter's visit from beyond the grave; Simon had manipulated the wife's grief in order to ease her husband's suffering. The whole thing is a set-up and Simon is the worst of all con artists. But fate is catching up with him.
Later that night, Simon stands waiting on an eerily deserted Underground platform. Just before a train arrives, Simon spots something out of the corner of his eye. A scarred figure charging towards him. Everything goes black. And the mystery begins. He wakes up in hospital, seemingly healthy; but something has been triggered and his life will never be the same again.
In the tradition of films such as The Sixth Sense; Memento and Donnie Darko, Puritan is an intelligent supernatural thriller which twists and turns, never letting the audience know its secret until the final moments of the film.