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, a Gray Tower dropout trained in Alchemy. Longing for retirement and a life of peace, she accepts one final job...extract a deadly warlock from Nazi-occupied France and prevent him from unleashing an alchemical weapon that will devour the continent.

But France is crawling with the Cruenti, vampiric warlocks who feed off other wizards. When things don't go according to plan, one Cruenti sets his deadly eyes on her.
Plans within plans. Plots versus counter plots. Heists gone wrong, Vatican wizards, and the greatest manipulation of history that has ever been seen, is just a taste of what Isabella George is in for, in her final mission.

Reading order of The Gray Tower Trilogy:
The Tower's Alchemist (Book 1)
Dark Rift (Book 2)
Circadian Circle (Book 3)