A fitness instructor marries a traumatized, crippled woman who suffers from PTSD and is tormented by a traumatic event that happened in her past. What is even more unfortunate is that her marriage is part of her maniac husband's evil scheme to kill her for her money. It isn't long before the formula is put into action and the gory body count starts to mount.

Directed by: Alberto De Martino
Written by: Alberto De Martino & Vincenzo Mannino
Release date: 1985-08-10
Runtime: 96 minutes
Tagline: Terrifying medicine!
Cast:
Christina Nagy Christina Nagy
Joanna 
David Warbeck David Warbeck
Craig 
Carroll Blumenberg Carroll Blumenberg
Ruth 
Rossano Brazzi Rossano Brazzi
Dr. Sernich 
Andrea Bosic Andrea Bosic
Father Peter 
Loris Loddi Loris Loddi
Father Davis 
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Also known as:
  • Formula for a Murder
  • Presencia siniestra
  • Formule pour un meurtre
  • Συνταγή για φόνο
  • 7, Hyden Park: Fórmula para Um Crime
  • Dehşet Çığlığı
  • Das Haus der Verfluchten