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Mexico City is being terrorized by an elusive serial killer. Meanwhile, widower Antonio Gómez (Ricardo Montalban), an underemployed musician, visits his ex-girlfriend to collect on an unpaid loan so he can purchase a guitar for his 10-year-old, Paco (Jose Perez). But, just after Antonio sees his old flame, the murderer sneaks into her place and kills her. Antonio suddenly becomes the prime suspect, so young Paco, who saw the real culprit exit the crime scene, begins tailing the killer himself. Wikipedia