Antefatto (1971)

75m (France), 76m (UK; Italy – cut version), 80m 35s (UK – on Redemption), 80m 54s (UK – on Hokushin), 82m (Germany), 90m (Italy)
35mm, Technicolor, 1.85:1
mono, English

An Italian horror film directed by Mario Bava. It proved influential on Friday the 13th (1980) and its sequels and on the American slasher movies of the 1980s onward in general. In the UK it joined the “” list in the 1980s.

Plot Summary

When an ageing heiress is murdered by her greedy husband out to get her money, it leads to a whole series of increasingly brutal killings. Relatives and family friends descend on the woman's house with their own agendas, most of which involve the wholesale slaughter of their rivals.


* = uncredited

Directed by: Mario Bava
no copyright was originally given but on versions released on DVD after 2001, an opening card claims the copyright as © 2001 International Media Films
International Media Films presents [only on DVD releases post-2001]
Produced by: Giuseppe Zaccariello
Screenplay by: Mario Bava, Joseph McLee [real name: Giuseppe Zaccariello], Filippo Ottoni, Sergio Canevari *, Francesco Vanorio *
From a Story by: Dardano Sacchetti and Franco Barberi
Director of Photography: Mario Bava
Editor: Carlo Reali
Music by: Stelvio Cipriani
Sound: Carlo Tarchi [not credited on Bay of Blood version]
Costume Designer: Enrico Sabbatini [not credited on Bay of Blood version]
Make-up: Franco Freda [not credited on Bay of Blood version]
Hairstylist: Adalgisa Favella [not credited on Bay of Blood version]
Special Effects: Carlo Rambaldi [not credited on Bay of Blood version]
Art Director: Sergio Canevari

Claudine Auger [Renata]
Luigi Pistilli [Alberto (Albert on English language prints)]
Claudio Volonte' [Simone (Simon on English language prints)]
Anna M. Rosati [Laura)
Chris Avram [Franco Ventura (Frank Ventura on English language prints)]
Leopoldo Trieste [Paolo Foscarri]
Laura Betti [Anna Foscarri)
Brigitte Skay [Louise (Brunhilda on English language prints)]
Isa Miranda [Countess Federica Donati]
Paola Rubens [Sylvie (Denise on English language prints)]
Guido Boccaccini [Roberto (Robert on English language prints)]
Roberto Bonanni (Luca (Mike on English language prints)]
Giovanni Nuvoletti [Count Filip Donati)
Renato Cestie [little boy] *
Nicoletta Elmi [little girl] *

Alternative Titles

The Antecedent
Bahia de Sangre – Spain
Baia Sangrenta – Portugal
La Baie sanglante – Belgium (French), France
A Bay of Blood – USA
The Bay of Silver
Before the Fact – Ecology of a Crime
Den Blodige Bugt
– Denmark
Bloodbath – UK (video)
Bloodbath Bay of Blood
Bloodbath Bay of Death
– UK
Così imparano a farsi e cattivi
Ecologia del delitto
– alternative title
Im Blutrausch des Satans – West Germany
Last House on the Left Part II – USA (re-release)
Last House – Part II
New House on the Left
Odore di carne
– pre-production title
Reazione a catena
Reazione a catena (Ecologia del delitto)
Twitch of the Death Nerve

See also
The Burning (1981)
Friday the 13th (1980)
Friday the 13th Part 2 (1981)
Friday the 13th Part III (1982)
Halloween (1978)
Halloween II (1981)
The Last House on the Left (1972)
L'ultimo treno della notte (1974)

Extracts included in
78/52 (2017)
Don't Scream It's Only a Movie (1989)
Mad Ron's Prevues from Hell (1987)



  • Cinefantastique vol.4 no.3 (Autumn 1975) p.36 – review
  • European Trash Cinema vol.2 no.6 pp.10-11 – review
  • Halls of Horror no.27 p.16 – note
  • Is It Uncut? no.5 p.35 – review
  • Monthly Film Bulletin vol.47 no.556 (May 1980) p.88 – credits, review
  • Positif no.138 (May 1972) pp.38-48 – interview with Mario Bava
  • Rue Morgue no.196 (September/October 2020) pp.12-22 – illustrated interview with Dardano Sacchetti (Legacy of blood by Robert Freese)
  • Sight & Sound vol.4 no.5 (May 1994) p.66 – video review
  • Starburst no.66 pp.40-41 – review
  • Variety 17 March 1971 p.36 – note
  • Variety 27 October 1971 p.26 – credits, review
  • Video Watchdog no.32 pp.10-11 – review
  • Video Watchdog no.58 (April 2000) pp.44-45 – review (by Tim Lucas)
  • Video Week 5 January 1987 p.8 – note


  • The Aurum Film Encyclopedia: Horror by Phil Hardy (ed.) p.233 – credits, review
  • Blood and Black Lace by Adrian Luther-Smith pp.3, 6 – illustrated credits, synopsis, review
  • Euro Gothic: Classics of Continental Horror Cinema by Jonathan Rigby pp.239, 240, 241, 255, 338
  • The Haunted World of Mario Bava by Troy Howarth pp.240-247; 342 – illustrated review; credits
  • Hoffman's Guide to SF, Horror and Fantasy Movies 1991-1992 p.117 – credits, review
  • Horror! 333 Films to Scare You to Death by James Marriott & Kim Newman p.154
  • Horror and Science Fiction Films II by Donald C. Willis p.407
  • The Mammoth Book of Slasher Movies: An A-Z Guide to Over Sixty Years of Blood and Guts by Peter Normanton pp.32-34
  • Mario Bava by Alberto Pezzotta pp.76-81
  • Mario Bava: All the Colors of the Dark by Tim Lucas pp.847-869 – illustrated review, synopsis, production notes, credits
  • by Walt Lee p.56 – credits
  • The Seduction of the Gullible (2nd edition) by John Martin p.29 – illustrated credits, synopsis, review