After swerving down a mountain road for several miles, Walter Shaw drives his Jaguar sedan into a ravine and is killed. By the terms of his will, Cannon is hired to determine if one of his beneficiaries was responsible.
A businessman's office is burglarized, the safe cracked, and the cash payroll stolen. A former business partner is the obvious suspect, due to his knowledge of the office layout and safe combination, but he has an alibi: he was in prison at the time.
Cannon is hired to handle a nighttime ransom delivery. After being led to various isolated phone booths by the kidnapper, Frank is slugged by the kidnapper's henchman, but he escapes and awakens the next morning in the desert with no memory of who he is or why he is there.