Barbara, finding her automobile disabled, is forced to go to the Storms reception in a taxi. The chauffeur brings her to the wrong house, and she finds herself greeted by The Blind Mole, as "English Rose." The Blind Mole, a picturesque Central American character, takes her into his confidence regarding his plans for a revolution in Costa Blanca. Suddenly Arenzo, a rival revolutionist, arrives with his followers, and in the battle that follows The Blind Mole is killed. Arenzo also thinks that Barbara is "English Rose," and forces her to accompany him. The scenes that follow, telling in exciting manner how Wallace and a reporter succeed in unraveling the mystery of Barbara's disappearance and how that adventurous girl thwarts the schemes of the "gun runners," culminate in a spirited conflict aboard the schooner which was to bear the revolutionists' arms to Costa Blanca.