He then published the comic novels: "John Goldfarb, Please Come Home!" (1963), "I, Billy Shakespeare" (1965), and "Twinkle, Twinkle, "Killer" Kane" (1966). He achieved critical success with these books – Marvin Levin in the "New York Times", for example, wrote: "Nobody can write funnier lines than William Peter Blatty, a gifted virtuoso who writes like "; but significant sales were lacking. It was at this point that Blatty began a collaboration with director Blake Edwards, writing scripts for comedy films such as: "A Shot in the Dark" (1964), "What Did You Do in the War, Daddy?" (1966), "Gunn" (1967), and "Darling Lili" (1970), a musical starring Julie Andrews and Rock Hudson. Blatty also worked on his own using the name "Bill Blatty" writing comedy screenplays such as those for the Danny Kaye film "The Man from the Diners' Club" (1963), and the Warren Beatty/Leslie Caron film "Promise Her Anything" (1965). Other screenplays include the film adaptation of "John Goldfarb, Please Come Home!" (1965), and "The Great Bank Robbery" (1969).