Ally of the Crown - The Heirs of Willow North, #1

Fiona, cursed with the power to ignite fire in a country where magic is illegal, wants to start a new life for herself, far from the mistakes of her past. A case of mistaken identity tangles her fortunes with those of the mysterious Sebastian, who intends to stop a blackmailer from destroying his family. Asked to help Sebastian infiltrate a sacred temple to find the damning evidence, Fiona soon goes from reluctant companion to trusted ally.
But Sebastian's secrets go deeper than Fiona realizes. What began as a simple heist becomes a web of intrigue entangling the governments of two countries. As Fiona's deceptions grow deeper, she must find a way to redeem her honor-and embrace a future she believes impossible.