Britt Reid, publisher of "The Sentinel" learns that racketeers are victimizing Frances Grayson, heiress of the Aluminum Productions millions. Disguised as The Green Hornet, he calls at the Grayson home and finds Stella Merja, an actress impersonating Miss Grayson. Forced to explain, Stella confesses she has been hired to pose as Miss Grayson and sign over control of her company. The Hornet finds Miss Grayson a prisoner and is helping her escape when a tree, struck by lightning, wrecks their car. They take refuge in an unoccupied lodge, but are followed. Will our masked hero be able to fight off the villainous racketeers? Will Miss Grayson escape with her life and fortune?