She flouted the laws of sorcery.  She besmirched the purity of her power when she took a life.

When her sister triggers a deadly curse, Cassie-Anne Carpenter must leave the only home she’s ever known to find the hidden city of Ruen and beg the help of the exiled Goddess of Sorcery. But finding Ruen is no easy feat.

To get there, Cassie must face the dangers of the Emperor’s Highway: mercurial bandits, zealot priests, cruel sorcerers, and her own heart to return with a cure before autumn’s first moon. Or her sister will suffer the consequences of her failure.