 Acting in concert with gemologist Harold Corbett, George Haley steals $300,000 in rough-cut gems from courier Raymond Harris by threatening to kill his family. Harris reports the robbery, but is reluctant to describe Haley. Corbett hides the gems in the collar of his German shepherd Chief, then arranges for Haley to take the train to Capital City for a flight to Mexico with Chief. Existing leads enable Dan Mathews and Sergeant Walters to arrest Corbett and they finally convince Harris to describe Haley. His description leads them to the train depot where they arrest Haley but are unable to find the gems. The final piece of the puzzle falls into place when Dan asks Corbett s secretary Laura Nelson to remove Chief s collar.