The Case of The Gold digger's Purse is a mystery of a wealthy man, Harrington Faulkner who is infatuated with his rare black gold fish called The Veiltail Moor Telescope. He wants to save his fishes from a deadly disease at any cost. Sally Madison, the gorgeous Gold Digger, has a boyfriend that has a cure for the disease which he invented which can cure the fish. In order to help her seriously ill boyfriend who is suffering from TB Sally sets up a deal with Harrington Faulkner. But her plans go haywire when the fish mysteriously disappear and Faulkner is murdered. Perry Mason is compelled to defend the client, Sally Madison, of whose innocence he is not confident in order to save Della Street, his secretary from going to jail.