Outlying plantations near where U.S. Marines are training the native troops are being plagued by El Vingador and his motley band of cutthroats. Lieutennat Dan Darrick is in charge and he has also fallen in love with Joan Grant, an American who owns a plantation. Another Marine officer, Jim Malone, is shipped in and he sets his sails and sights on Joan , who has left her plantation for the safety of the Marine camp. Escorted by and Malone and some troops, Joan rides out to get some money from her plantation safe but she unwittingly leads them into an ambush by the bandit gang.
—Les Adams <longhorn1939@suddenlink.net>