Pyromancist by Charmaine Pauls

Fifty houses have been burned to the ground in a fisherman’s village in France. Who would do such a thing? Why target the quiet little village? The police say it’s arson, but their forensic scientists can’t find the cause. If Clelia isn’t the guilty party, then why did the fires start at the same time as her sleepwalking? Why is she dreaming about Joss, her secret childhood crush who abandoned their village nine years earlier? She doesn’t know why Joss is coming for her in her nightmare. All she knows is that she has to run. As fast as she can.

(Each book in the 7 Forbidden Arts series reads as a standalone, but there’s also a series arc.)