Valley of Kings - Michael Northrop

The third book in a brand new epic Egyptian adventure!
If Alex and Ren are going to stop the Death Walkers, they know they
have to find the powerful Lost Spells. So they head to the Valley
of Kings, deep in the Egyptian desert-where they discover that
Egypt is in the grips of madness. Voices in the air whisper dark
secrets and flashes of light burn across the night sky.
But their hunt for the Spells keeps getting sabotaged. Every step
they take, The Order is hot on their trail. There's no dodging,
no hiding. Is someone leaking their secrets?
Is there anyone they can trust?