Reading that a certain dealer has an ancient Egyptian mummy for sale, an antique professor goes out to inspect the curio. It meets with his satisfaction and he purchases it. He begins to carry the thing home, and meets with quite a little trouble; but his will makes the way and he reaches his room safely. Anxious to begin his investigations, he sheds his coat quickly, rolls up his sleeves, and taking his huge carving knife in hand begins to cut the mummy up. His old landlady passes by and sees her boarder at his peculiar work; he is so engrossed in his task that he does not see her, and she, catching a glimpse of a human form, runs out in alarm. With the cry that a man is being cut up in her house, she summons the butcher, the baker, the grocer and a score of women, who follow in wonder. The entire crowd goes to a police station and they summon the chief and the whole force. Now the army marches into the house, where, cautiously, they climb the stairs. One brave fellow opens the door and the whole mob soon clusters about the sarcophagus. But their alarm turns to naught when they see that it is only a mummy, and they depart in laughter. In the last view the professor is showing the old woman what's in a mummy.
—Moving Picture World synopsis