Cannon is hired to find a plane that disappeared while landing... with millions in bearer bonds onboard.

Ross Byron hires Cannon after his house is burglarized and $500,000 disappears from his safe. Ross says that Alex Whitehead is guilty of committing the robbery because he held a grudge against him. Both men had been partners in creating a special scanner that made both rich. But then Whitehead began to live it up and lose money and Ross broke the partnership. However, Cannon discovers that Whitehead is serving time in prison and was there when the burglary was committed.