 The ending of the movie is inspired by the ending of  Thomas Harris (I) (qv)s book “Red Dragon”. In an interview in  Luca Palmerinis book “Spaghetti Nightmares”, Argento states that he  did not like Michael Mann (I) (qv)s _Manhunter (1986)_ (qv), the  first film adaptation of “Red Dragon” which used a completely  different ending from the one in the novel, but is a fan of Harriss  novel. (_Red Dragon (2002)_ (qv) later adapted this ending more  faithfully.)