Between Two Thorns — Emma Newman

Something is wrong in Aquae Sulis, Bath's secret mirror city.

The new season is starting and the Master of Ceremonies is missing. Max, an Arbiter of the Split Worlds Treaty, is assigned with the task of finding him with no one to help but a dislocated soul and a mad sorcerer.

There is a witness but his memories have been bound by magical chains only the enemy can break. A rebellious woman trying to escape her family may prove to be the ally Max needs.

But can she be trusted? And why does she want to give up eternal youth and the life of privilege she's been born into?