From the Tor/Forge intro:
1954: Cade Martin, hero of The Midnight Front during the Second World War, has been going rogue without warning or explanation, and his mysterious absences are making his MI6 handlers suspicious. In the United States, Briet Segfrunsdóttir serves as the master karcist of the Pentagon’s top-secret magickal warfare program. And in South America, Anja Kernova hunts fugitive Nazi sorcerers with the help of a powerful magickal tome known as The Iron Codex.
In an ever-more dangerous world, a chance encounter sparks an international race to find Anja and steal The Iron Codex. The Vatican, Russians, Jewish Kabbalists, and shadowy players working all angles covet the Codex for the power it promises whoever wields it.
As the dominoes start to fall and one betrayal follows another, Anja goes on the run, hunted by friend and foe alike. The showdown brings our heroes to Bikini Atoll in March 1954: the Castle Bravo nuclear test.
But unknown to all of them, a secret magickal cabal schemes to turn America and its western allies toward fascism—even if it takes decades….
Follow my heroine Anja into a magick-fueled, globe-hopping Cold War-era spy thriller! The Iron Codex will be published in trade paperback, eBook, and digital audiobook formats in North America on January 15, 2019 by Tor Books.