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William S. Hart forsakes his usual western surroundings in favor of the Great Northwest in Shark Monroe. Hart of course plays the title character, a ruthless seal-hunter who is feared by one and all. While heading towards the Klondike in his schooner, Monroe takes on two passengers, lovely Marjorie Hilton (Katherine MacDonald) and her milksop brother Webster (George McDaniel). Chafing under Monroe's strict disciplinarianism, Webster vows to get revenge some day, while Marjorie expresses similar contempt for her "host." Upon arriving in Alaska, Marjorie is strong-armed into a marriage with villainous hotel proprietor Big Baxter (Joe Singleton). Monroe "rescues" the girl by abducting her from the wedding ceremony and marrying her himself, forcing her to accompany him on his next voyage. Sensing that Marjorie resents this rough treatment, Monroe reveals that their marriage was a sham and promises to reunite her with her brother at the first opportunity. To prove that his intentions are honorable, Monroe allows Webster to beat him in a fistfight. Assuming that Monroe has lost his nerve, Big Baxter contrives to insult him in front of a huge crowd. Pushed to the breaking point, Monroe kills Baxter -- at which point Marjorie finally "understands" the taciturn hero and declares her love for him.