What is the setting of the story Beyond the Grave by Jude Watson?

The majority of this story takes place in Egypt, mostly in
the capital city of Cairo, as the two heroes of the story, Dan and Amy, track down clues
that lead them to study Pharaohs and goddesses and the ancient history that surrounds
them.  Some of the secrets they discover are in ordinary places, like their hotel, and
others in places you would expect in Egypt.

The book is a
mystery, and so the setting is both important and approproate since there are still so
many mysteries in that country and desert, and so as the clues lead to other clues, the
reader is taken on a tour of the ancient lands.  The book is the fourth installment of
"The 39 Clues" series.