Posing as a couple who are answering an ad in the newspaper, Clark and Lois infiltrate the lair of the Leopard Woman. Will Nita see through their ruse? Of course, and the reporters soon find themselves locked in a basement cell.
Clark tunes his super hearing in on the captors, while Lois cringes at the damp dongeon. What will he learn from the conversation of the Society of the Leopard? Clark fakes knowledge of a couple loose bars on the cell, and escapes with Lois.
The reporters need to act fast. Lois is to warn Major Campbell of the hideout. Clark springs into action to intercept an enemy submarine. Will they be able to stop a torpedo from striking an oil tanker?