Faraday and Company (1973)

Private investigator Frank Faraday, falsely accused of murdering his partner, escapes from a South American prison after 28 years' confinement. Returning to a Los Angeles greatly changed during his absence, Frank discovers that he has an adult son named Steve, also a private investigator. Steve is the son of Frank's girlfriend, Lou Carson, who had taken over Frank's agency. Father and son now work together to solve mysteries, while Frank tries to adjust to contemporary life.