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In chapter three of The Vigilantes are Coming, Don Loring, aka "The Eagle" (Robert Livingston), smartly dives through a (hitherto unseen) window in the powder house, thus staying completely clear of the ensuing explosion. After leading the Cossacks on a merry ride to nowhere, Don is able to meet with the Vigilantes and sign a pledge of allegiance. But Peters (Tracy Layne), the traitor, absconds with the tell-tale document sharply followed by "The Eagle's" sidekick, Salvation (Guinn "Big Boy" Williams). Determined to learn Peters' identity, the latter steals into the fortress but is caught by Petroff (Bob Kortman) and his Cossacks and brought before a firing squad. Alerted to the danger, the captured Doris Colton (Kay Hughes) releases a homing pigeon with a warning note to Don, who hastens to the rescue. But just as "The Eagle" is about to free his friend, the Cossacks send forth a deadly round of lead.