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Mob boss Big Jahnchek (Peter Whitney) escapes Federal custody and makes a beeline for his brother Gregory (R. G. Armstrong), who has managed to bury his connection to Big Steve by changing his name to John Gregory and establishing a successful fleet of tuna boats. Motivating Big Steve's getaway is the fact that the $100,000 trust fund of Helen Gregory (Susan Seaforth), whom each brother has at one time or another claimed as his own daughter, is being mismanaged by crooked Franz Moray (Steven Geray). When Moray is murdered, Gregory is charged with the crime, and a disturbing Jahnchek family secret is in danger of being exposed. It is up to Perry Mason to clear Gregory in court and to provide a happy ending for those who truly deserve one.