There are 3 books in the The Gray Tower Trilogy series. The newest book is Circadian Circle which came out in 2014.

1
The Tower's Alchemist

By Alesha Escobar , Amanda Lyons (editor) ,

Book cover of The Tower's Alchemist
British intelligence wants her spying skills. A vampiric warlock wants to steal her powers. The Master Wizards who trained her want her dead...

Nazis have unleashed occult forces throughout Europe, and the Allies are forced to recruit wizards to counter their attacks. Among them is battle weary spy, Isabella George,…

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2
Dark Rift

By Alesha Escobar , Amanda Lyons (editor) ,

Book cover of Dark Rift
The world already suffers a bitter taste of hell on earth, in a World War II where Nazi warlocks battle with Gray Tower wizards in the streets of Europe and in the shadows.

The Gray Tower, in its quest to stabilize a world that hangs on a delicate balance, has…

3
Circadian Circle

By Amanda Lyons (editor) , Alesha Escobar ,

Book cover of Circadian Circle
If saving the world meant descending into darkness, would you still do it?

In this gripping, action-packed conclusion to The Gray Tower Trilogy, vampiric warlocks are the least of Isabella George's troubles.

The Gray Tower is broken, and dark forces gather, promising destruction to those who stand on the side…