A Matter of Fatal Importance (1973)

The Antonis Maras, a successful professional, and his wife Olga live a peaceful and happy life until the Antonis discovers the double life of his wife. Instructs s` an employee to monitor and eventually will discover that the husband goes secretly to a remote house. The secret of Olga, however, is that extorted by a coil holding her brother hostage. The brother of escapes and suicides and members of Spiral abduct Olga.