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This typically overbaked Cecil B. DeMille opus takes place off the seacoast of Brittany. While ambling along the beach, peasant maiden Marcia Manot (Geraldine Farrar) finds the Devil Stone, a "cursed" emerald that originally belonged to a Viking Queen. Marcia doesn't realize the emerald's value, but mercenary American Silas Martin (Tully Marshall) does, and to get possession of the gem he marries the girl. Once he's gotten what he wants, Martin conspires with his business manager Guy Sterling (Wallace Reid) to frame Marcia on adultery charges and then sue for divorce. But Sterling has a change of heart, and informs Marcia of Martin's plans. Angrily attempting to retrieve the emerald, Marcia accidentally kills her hateful husband. Detective Robert Judson (Hobart Bosworth) quickly figures out who murdered Martin, but out of sympathy for Marcia he merely advises her to get rid of the Devil Stone and marry Sterling, who by now has fallen in love with her. The Devil Stone was the last of opera diva Geraldine Farrars starring vehicles for Cecil B. DeMille, though it was far from her final screen appearance.