While running for re-election, District Attorney Frank Scanlon narrowly escapes a car explosion. Rumor spreads that the attack was the work of Calvin Ryland, his electoral opponent. But it is his brother, Warren Ryland, who so desperately wants Scanlon out of office. The Green Hornet manages to track Warren down and, on his usual pretense of being a shady crook, offers to help his brother by pulling a crime wave to make Scanlon look bad. But Warren has an even surer plan to guarantee Calvin's election. If successful, it may cost the Green Hornet his life.
—Twenty Penguins