Taking place 30 years after the events of The Mummy's Hand, where Andoheb (George Zucco) has survived and plans revenge on Stephen Banning (Dick Foran) and his entire family in Mapleton, Massachusetts.

At the first full moon, the mummy is fed tanna leaves which allow him to break into the Banning residence and kill the now elderly Stephen.

After passing on the instructions for the use of the tana leaves, and assigning the task of terminating the remaining members of the Banning expedition and their descendants, Andoheb expires.

In the dark of the night, the monster stealthily enters the Evans's home and abducts the fainting girl to the cemetery caretaker's hut.

Bey unveils his plan to the reluctant Isobel, that she is to become his bride, as a "High Priest of Karnak", and bear him an heir to the royal line.

Inside the home, Banning has a fight with Kharis and holds him at bay with a torch while he rescues Isobel from the mummy's grasp, but inadvertently sets fire to some curtains.

The townspeople keep the mummy from similarly escaping by hurling additional torches at him, and the monster perishes in the flames of the thoroughly consumed house.

Banning and Isobel wed in short order, as he has received his draft notice and is due to report for his tour of duty in World War II.

[3][4] The 2023 BearManor Media book "The Mummy's Tomb" by Tom Weaver et al. provides the full story of the making of the movie, plus script, pressbook and other extras.

[4] From contemporary reviews, Harrison's Reports stated that "much happens, but nothing that will surprise the horror fans",[5] while Theodore Strauss of The New York Times proclaimed "no wonder the Mummy lasted for 3,000 years.

If I could have picked my roles, I would have played these kinds of heavies, people who have a mental quirk or who for some reason or another, are acting against the positive side of the plot of the picture".