The Ninth Configuration (also known as
Twinkle, Twinkle, "Killer" Kane) is a 1980 American film directed by
William Peter Blatty. The film is based on Blatty's novel
The Ninth Configuration (1978), which was itself a reworking of an earlier version of the novel, first published in 1966 as
Twinkle, Twinkle, "Killer" Kane!. The initial 1966 publication of the novel featured an
exclamation mark at the end of the title, while all subsequent publications saw it removed.