REALLY enjoyed this one! I wasn't sure what to expect (WW2 and warlocks?) but this one was a fun read.
It starts with the main character, Isabella, who is tired of the spy life and wants to retire. However Europe is raging with war, as the Nazis have allied with warlocks to create deadly weapons and frightening creatures in order to win.
Isabella is an alchemist trained by the Gray Tower, and agrees to go on a mission (which she hopes to be her last) and has to extract another alchemist who created the deadly "Plague."
Of course it wouldn't be fun if the mission was easily accomplished, so she has to fight her way through dangerous enemies, and eventually she finds out that the people who trained her aren't the benevolent mentors she thought they were.
I'll stop there because I don't want to spoil anything, but there are definitely intriguing questions (some of which are answered, others that are promised to be answered).