Cold Fire (The Circle Opens #3)

The third book in an extraordinary fantasy quartet by acclaimed fantasy author Tamora Pierce.Daja and Frostpine expect to spend some peaceful weeks with old friends in Namorn. But things begin to go awry as soon as they arrive. First Daja discovers that their hosts' twin daughters are mages. Then mysterious fires begin to blaze across the frigid city. Daja works with Bennat Ladradun, to locate what seems to be a serial arsonist. Daja's magic saves the city from going up in flames, but nothing and nobody can save her the disappointment of learning that the arsonist is someone close to her own heart.