The Oracle Betrayed — Catherine Fisher

Mirany and Seth hold the future in their hands

The High Priestess interprets the wishes of the god as conveyed through the Oracle. Mirany serves the High Priestess. But when the god speaks to Mirany, she realizes that the High Priestess does not hear him, that she is manipulating the choosing of a new God-on-Earth for her own gain.

Mirany must join forces with Seth, a young tomb-robbing scribe who knows the secrets and hidden passages of their land, if she is to defeat the treachery that grips the kingdom. But they have powerful enemies who will stop at nothing to destroy them.