Day of the Scarab by Catherine Fisher

Argelin has killed the Speaker and silenced the Oracle, but who can truly silence the words of the god? The Archon and Seth return from their desert ...more Argelin has killed the Speaker and silenced the Oracle, but who can truly silence the words of the god? The Archon and Seth return from their desert journey to find that Argelin has declared war on the gods, Mirany is in hiding, and what remains of the Nine are scattered. And whose is the sinister new power hidden in the sign of the Scarab? 

To stop the madness, Mirany and the Archon must make the final impossible journey of the soul--through the Nine Gateways into death...and then back again.