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On the planet Thanagar, Hawkman and Hawkgirl report to their chief, Andar Pul, about the progress they're making learning Earth police methods. They relate to one of their recent adventures on Earth, where a priceless black pearl necklace was stolen from the Midway Museum. Taking on their guises of Hawkman and Hawkgirl, they decide to put on a friendly competition between each other: Hawkman will try to solve the crime using only Earth police methods, while Hawkgirl only uses Thanagarian police methods.
At first, Hawkgirl has the upper hand using Thanagarian crime fighting devices that give her an initial leg up, however Earth's environment proves too unstable for the sensitive machines which are constantly malfunctioning due to Earth's changing weather patterns. Hawkman, meanwhile uses a number of Earth police methods to link the chain of evidence that leads him to the crooks who took the necklace. After fighting them off at a hunting site, Hawkman deduces that they hid the necklace in an unfired barrel of a shotgun until they were able to sell them off. Capturing the crooks, Hawkman returns back to the museum to tell the story to a flustered Hawkgirl.
Finishing their story, Andar finds their research in Earth police methods continually useful and decides that the police force on Thanagar should take up some of these methods. With Andar Pul's permission, Hawkman and Hawkgirl are sent back to Earth where they can learn more about Earth's police methods.