Given the below context:  In 1938 Egypt, a team of archaeologists discover the tomb of pharaoh Ahkmenrah, including a young Cecil Fredericks, finding the magical Tablet of Ahkmenrah. The locals warn the group that removing the tablet will end its magic. In present-day New York City, Larry Daley remains the night guard of the American Museum of Natural History. He, Theodore Roosevelt, Sacagawea, Attila the Hun, Jedediah, Octavius, Rexy the Tyrannosaurus rex skeleton and Dexter the capuchin monkey help re-open the Hayden Planetarium. A new wax Neanderthal resembling Larry named Laaa is introduced, identifying Larry as his father. Ahkmenrah shows Larry that the tablet is corroding, which later causes the exhibits to act erratically, causing mayhem at the planetarium's reopening. Afterwards, Larry catches his son Nick, who plans on taking a gap year to sort out his life, throwing a house party. Larry reunites with Cecil, now in retirement, who realizes the end of the tablet's magic will cause the exhibits to become lifeless. Cecil explains that Ahkmenrah's parents, Merenkahre and Shepseheret, may be able to restore the tablet's power but that they are located in the British Museum. Larry convinces the museum's curator, Dr. McPhee, to let him ship Ahkmenrah to London to restore the tablet, convinced that McPhee knows its secrets. Larry and Nick travel to the British Museum, bypassing the night guard Tilly. To Larry's surprise, Roosevelt, Sacagawea, Attila, Jed, Octavius, Dexter and Laaa have come as well, and Laaa is left to stand guard while the others search the museum, the tablet bringing its own exhibits to life.  Guess a valid title for it!
The answer to this question is:
Night at the Museum: Secret of the Tomb