The Exorcism of Emily Rose is based on Felicitas Goodman 's book , The Exorcism of Anneliese Michel .
The film is loosely based on the story of Anneliese Michel and follows a self-proclaimed Agnostic who acts as defense counsel ( Linney ) representing a parish priest ( Wilkinson ) , accused by the state of negligent homicide after he performed an exorcism .
The Exorcism of Emily Rose