The checkmate team is being held hostage by a gang led by rogue gangster Joe Farrell, who is running from the mob. He demands that Don act as courier for his estranged wife and a fortune in stolen cash, or Jed and Dr. Hyatt will die. When Don discovers that one of Farrell's men plans to double-cross Farrell, Don tries to take advantage of the situation by pitting the two men against each other.
