Spider is a 2002 Canadian/British psychological thriller film produced and directed by David Cronenberg and based on the novel of the same name by Patrick McGrath, who also wrote the screenplay. Spider is the story of Dennis Clegg, a man who is given a room in a halfway house catering to mentally disturbed persons. Clegg has just been released from a mental institution and in his new abode starts piecing together or recreating in his memory an apparently fateful childhood event. He roams the nearby derelict urban area and the local canal and starts to relive or visualize a period of his childhood in 1950s London with his mother and his father. A shift takes place in the child's psyche when he witnesses his mother groping with his father in the garden and, subsequently, when he sees his mother in a silky night gown she wore for his father.