There are 3 books in the The Spiritwalker Trilogy series. The newest book is Cold Steel which came out in 2013.

1
Cold Magic

Book cover of Cold Magic
From one of the genre's finest writers comes a bold new epic fantasy in which science and magic are locked in a deadly struggle.

It is the dawn of a new age. . . The Industrial Revolution has begun, factories are springing up across the country, and new technologies are…
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2
Cold Fire

Book cover of Cold Fire
Cat Barahal and her beloved cousin Bee think they have reached a safe place to shelter. But the Cold Mages who are conspiring to take them prisoner are closing in. The warlord who hopes to conquer all Europa is convinced their destiny is to aid him, whether they want to…

3
Cold Steel

Book cover of Cold Steel
The fantastic conclusion to the Spiritwalker trilogy!

Trouble, treachery, and magic just won't stop plaguing Cat Barahal. The Master of the Wild Hunt has stolen her husband Andevai. The ruler of the Taino kingdom blames her for his mother's murder. The infamous General Camjiata insists she join his army to…