An ambassador from Suari and his code clerk kill the chief of security in an attempt to make it look like the chief was a traitor, who blew up the legation safe and stole £600.000 on behalf of a dissident group. But Columbo gets suspicious. He just has one problem crushing the ambassador's alibi and then, when the code clerk turns up dead, the ambassador has an alibi again. But even if Colombo could rock the two alibis, there is always the immunity problem.

The owner of a bull ranch in Mexico gives his workers the day off, and then talks his number one man into fighting the bull who nearly killed his son. But instead he shoots him with a tranquilizer gun, and lets the bull kill him. Colombo, who is on vacation in Mexico, gets dragged into this case by an admiring colleague, but he has trouble convincing the Mexicans that the accident is really homicide. And how do you prove that the bull is a murder weapon?