Geoffrey Lascelles arrives home at 3:00 AM under the influence of liquor after being an honored guest at a banquet celebrating his engagement to Violet Manning. Soon after his arrival to his apartment, Simpson, an English silly-ass who is interested in archaeology and things occult, arrives with an Egyptian mummy. Lascelles is very much put out to think of Simpson bringing the mummy to his apartment and Simpson goes away, leaving it there for the night. In a dream Geoffrey sees the mummy case yield up its body in the form of a beautiful young girl, who steps out into the room in all the pomp and splendor of an Egyptian princess of three thousand years ago. Struck dumb with amazement, Lascelles has to put her up for the night. She has great difficulty getting into his pajamas which she wears over her robes. Lascelles sleeps in the living room. Next morning he takes her to the home of his fiancée. The adventures of the Princess in this home are very amusing and show the various encounters with the telephone, matches, cigars and other conveniences of modern times. Angered at Simpson, she decides to poison him. The butler has prepared the poison and after Simpson is informed that he is about to die the butler tells him that the white crystals were only table salt. After a grand row, he finally gets the Princess back to his quarters where he awakens from his dream.
—Moving Picture World synopsis