A Spanish singer, known as "El Ángel", owner of a nightclub, lives a double life as an expert in alarms for gangs of thieves. In his last robbery, he betrays his partners, and his lover is kidnapped and he is blackmailed. Thinking that she has betrayed him, he abandons her to her fate. Finally, she committed suicide. El Ángel reconsiders his life and decides to become a monk. But his former life will meet him within the walls of the monastery.

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