First one stranger, then another, arrive at the presidio, each with a government pass and each claiming to have been robbed by the notorious Captain Fly-by-Night and his highwaymen. The soldiers and Señorita Anita believe the first to be Fly-by-Night and the second to be Señor Rocha, Anita's fiancée and emissary of the governor. But the first stranger, to whom Anita is drawn, proves to be on a government mission and exposes the second stranger as Captain Fly-by-Night.