The Forecast(1915)

Wealthy bachelor Forest Keene lives in a mansion with his nephew Rex Booth and housekeeper Janet. Rex and Janet are in love with each other, but Keene objects to the match threatening disinheritance in the event of a marriage. Gifted with an ancient knife, Keene nods off holding it, falling into a nightmare where he sees the ruination of them all because of his obstinacy. Awakening he realizes the folly of his objections and gives his consent to Rex and Janet’s union.