The son of the notorious Dr. Henry Jekyll is determined to prove that his father's reputation has been unjustly deserved. He sets out to develop his father's formula in order to prove that he was a brilliant scientist rather than a murderous monster.

A bookie uses a phony real estate business as a front for his betting parlor. To further keep up the sham, he hires dim-witted Ellen Grant as his secretary figuring she won't suspect any criminal goings-on. When Ellen learns of some friends who are about to lose their homes, she unwittingly drafts her boss into developing a new low-cost housing development.

A cheating husband is charged in the poisoning death of his invalid wife, in spite of other women and suicide also being suspected.