Blueprint for a Massacre (Italian: Tecnica per un massacro, Spanish: Técnica para un sabotaje or Agente Z 55: Secreto atómico), also known as Agent Z-55: Atomic Secret, is a 1967 Italian-Spanish Eurospy film co-written and directed by Roberto Bianchi Montero and starring Germán Cobos.

[1] The film was shot back to back with Desperate Mission, of which it is the sequel.

[2] During the shooting, Nick Nostro replaced Montero for two weeks.

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