Eye of the Moon by Dianne Hofmeyr

I stood transfixed. As I stared into those fiery eyes, I felt I was invoking her anger.
Standing waiting for her deadly bite.
I clasped my arms across my chest and held my hands to my throat for protection.
Such was her power!
She sat on the Pharaoh's brow with her hood flaring.
Ready to spit poison at all his enemies, ready to burn them with her fiery glare...

A murderous plot and a battle for succession sets brother against brother, and drives two girls to war in this thrilling adventure set in Ancient Egypt.

The beautiful Queen Tiy of Egypt has died. Now there is a plot to murder her eldest son, Tuthmosis, and steal his throne. Isikara has no choice but to help save him. On the run with the young prince, she travels to Nubia in search of allies to return him to his rightful throne. Their journey takes the two teenagers along the Nile, across the desert and through bustling bazaars, accompanied by an exotic slave dancer, as they fight to stay one step ahead of their pursuers: the High Priests who wish to silence them. But danger and death are all around. Who can they trust - and where will their adventure lead them?