The Cisco Kid saves a boy from a tar-and-feather mob and recovers stolen jewels. Cisco and Pancho snatch young cowhand Mickey Doane from an angry mob who ganged up on him when he defended opera singer Marla Fontaine form their booing. While Cisco is cleaning up Mickey, Marla is robbed of her valuable jewels by several of the mob who hooted her performance. To divert attention from themselves, the leader of the thieves accuses Mickey of the robbery. Mickey flees to a shack, followed by a phony "posse" of the real jewel thieves. Just as the thieves have surrounded the shack and prepare to lynch Mickey for his "crime", Cisco and Pancho thunder onto the scene for a blazing battle with an exciting surprise ending.