The Killer Is One of Thirteen

A recent widow has invited a group of family friends to her large and secluded country home. However, what the guests don't know is that the reason they've been assembled is that their host suspects one of them might be her husband's killer and she's intent on uncovering the identity of his murderer. As the guests begin to suspect each other, revealing long-kept and sinister secrets in the process, an unknown, black-gloved killer begins bumping them off in a variety of nasty ways.

• 
  Javier Aguirre
• 
  Juan Antonio Arévalo

• 
  Patty Shepard
  Lisa Mandel
• 
  Simón Andreu
  Harry Stephen
• 
  José María Prada
  Martin
• 
  Trini Alonso
  Bertha
• 
  Dyanik Zurakowska
  Srta. Hoven
• 
  Jack Taylor
  Harlan
• 
  Paul Naschy
  Ernest
• 
  Ramiro Oliveros
  Henry
• 
  Doris Coll
  Cecilia Parolli
• 
  Alberto Fernández
  Jorge
• 
  May Heatherly
  Sylvia Martin
• 
  Carmen Maura
  Laura
• 
  Paloma Cela
  Elena
• 
  Eusebio Poncela
  Francis
• 
  Eduardo Calvo
  Guillermo
• 
  Rosa de Alba
  Elena
• 
  Blaki
  The Gardener
• 
  Marisol Delgado
  The Maid