 Frederick Rollins and Tom Wyatt have discovered a cure for gill fever, a deadly goldfish disease. As they plan to market the product, they find that entrepreneur Jack Huxley has bought the aquarium supply business and owns all patents and intellectual property. Huxley s marriage is on the rocks and he breaks up with his girl friend. Huxley s partner, Dan Myers, despises him and tries to double-cross him. Huxley is murdered, Wyatt is charged with the crime, and Perry Mason has to sort everything out.