Formula for a Murder
1985
Formula for a Murder is a 1985 Italian giallo film co-written and directed by Alberto De Martino. The film was shot in Boston and Italy, and was one of the last films directed by De Martino. When it was released in Italy, it war marketed as a more traditional horror film, while retrospective analysis compared it to 1960s thrillers such as Taste of Fear (1961). imdb.com