Spy Glass by Maria V. Snyder — book slip

After sacrificing her own blood magic to defeat an enemy, Opal Cowan has lost her powers and become immune to magic. Now an outsider, she discovers that the glass pieces she creates flash in the presence of magic.

Upon learning that someone has stolen her blood, Opal embarks on a journey to retrieve it, hoping to regain her abilities or determine if they are lost forever.

As she navigates a world filled with political intrigue and betrayal, Opal must decide whom to trust and how to secure her future.

Third in the Glass Series, part of The Chronicles of Ixia by Maria V. Snyder.