The mummy Imhotep needs the Manacle of Osiris to fulfill his quest to rule all mankind, but it's stuck on Alex's wrist, and only the Lost Scrolls of Thebes can remove it without destroying its power.
Alex and Jonathan find a hidden chamber in the ruins of the Library of Alexandria, and it just may hold the secret to the location of the scrolls.
A clue about the scrolls in the diary of Alexander the Great takes the O'Connells into the Egyptian desert, where they encounter Imhotep, who is also searching for the same palace.
When powers from the Manacle of Osiris start to manifest, Alex worries if he'll be able to handle them. Meanwhile, the gang searches for treasure in an ancient underwater city.
En route to Australia, the heroes crash-land on a small tropical island, summoning a long-dormant lava creature that pushes the local volcano toward eruption.
Imhotep races to beat the O'Connells to New York City, where he plans a dangerous "empowering" ceremony at the Statue of Liberty.
In an effort to locate the scrolls, Weasler and Imhotep kidnap Albert Einstein, and it's up to our heroes to save the genius before he shares any valuable information.
A vision takes the family to a mountaintop in Peru, where they meet the legendary Cloud People and the Native American spirit that protects the area from outsiders.
The O'Connells travel to a deserted Russian palace and come to realize that Alex has released a mythical creature that feeds on fear.
While in China, Alex befriends the young emperor of the Forbidden City, who promises to help find the lost scrolls - but instead accidentally unleashes a demon dragon.
A werewolf bites Rick when the family visits an abbey in Ireland, and Evy and Alex turn to the local townspeople for help.
The search is on for the three pieces of the Puzzle of Horus, which may lead the O'Connells to the Scrolls, but first they must battle Imhotep, Weasler and a giant sandworm.
The scrolls finally are found in the catacombs under Paris, but Alex is forced to take desperate measures in order to stop Imhotep.
