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Henri Lamont (Jack Drumier) is a post trader who runs illegal liquor on the side. Two of his associates, Jean and Pierre Dubois (Clay Clement and John Davidson), are rivals for his niece, Julie (Dorothy Green). Julie, however, wants nothing to do with either of them and escapes to an infamous "haunted rock." She falls asleep in a cave there and is found by a party of engineers headed by Tom King (Arthur Ashley) and his friend, Harry Reynolds (Kempton Greene). Julie and King fall in love, much to the chagrin of the Dubois brothers. Since King has a fraternity pin that's supposed to ward off evil spirits, Jean and Pierre plot to steal it. To keep them away, King's pal disguises himself as the mysterious ghost of haunted rock. The Dubois brothers' efforts to kill King fail, and they wind up dead themselves. This leaves King and Julie able to pursue their romance in peace.