Ghost in the Ring

Caina Amalas was once a deadly Ghost nightfighter, a spy and agent of the Emperor of Nighmar. Now she only wishes to live quietly with her husband.

But civil war grips the Empire, and Caina's skills are needed against the cruel sorcerers of the malevolent Umbarian Order. 

And Caina has a dangerous connection to the Umbarians. 

For Caina's mother had many secrets, secrets that might yet kill Caina herself...