In the opening show. Khan. played by Khigh Dhiegh, clears a professional football player who is accused of clubbing his girl friend to death with a statue. The ball player, a black quarterback, was framed by one of his coaches who was trying to keep him out of a championship game. The coach was working for professional gamblers.
When a mysterious swordsman, wearing the mask of a secret Chinese society, threatens the members of a wealthy family, the head of which he's already slain, Khan (Khigh Dhiegh) tracks him down. How? With his intimate knowledge about the people who live in San Francisco's Chinatown? that's how Daughter Anna and son Kim lend a hand—as they will every week
Girl is murdered in a lonely beach cottage, and her father hires Khan to get evidence on wrong killer.
On the eve of an auction, a priceless diamond collection is stolen by three men and a girl. Police suspect that an ex-Ml5 officer in charge of security is implicated but Khan has unswerving confidence in his old friend.
The murder of a doctor who was a friend of Khan's leads to a crime syndicate that deals in both gambling and narcotics.
Khan has only 24 hours to find an oil heiress who is being held for a huge ransom.
A man commits murder to obtain a precious piece of jade reputed to bring bad luck to its owners.