At the request of a parole officer, Perry Mason takes on the case of Tony Polk, who is accused of murdering Grace Knapp. It doesn't help the case that Knapp's neighbor was standing only a few feet away when the killing occurred. Polk was out promoting a popular TV show about a handsome buccaneer and, dressed as a pirate, was supposedly seen killing the woman with his pirate's hook. Grace was in a drunken rage that night demanding her money. It turns out that the actor who plays the Buccaneer, Martin Eldridge, is still married to Grace Knapp and that she may have been blackmailing him as he has remarried. Tony's pregnant wife is taken captive twice, once with Della, by another man wanting the money - $25,000. There were several men out that night dressed as pirates promoting the show so there are other suspects. It's left to Perry to untangle hidden identities and find who else would have wanted Knapp dead.
—garykmcd