The Sister-in-Law 1974

Synopsis:

Robert and Edward are brothers involved in a web of adultery and deceit. They share Edward's wife and his mistress and a mission to deliver a package of jewels across the Canadian border, but the mission turns out to be deadly.

Directed by: Joseph Ruben
Written by: Joseph Ruben
Release date: 1974-07-04
Runtime: 85 minutes
Tagline: She Helped Her Husband Destroy His Brother By The Most Immoral Act Imaginable
Cast:
John Savage
John Savage
Robert Strong 
Will MacMillan
Will MacMillan
Edward Strong 
Anne Saxon
Anne Saxon
Joanna Strong 
Meridith Baer
Meridith Baer
Deborah Holt 
Frank Adonis
Frank Adonis
Benjo 
Jonathan Oppenheim
Jonathan Oppenheim
Fat Man