Petra Kurková--a witch who wields magic worth its weight in gold--is tasked with combating the undead on World War I's eastern front. The battlefield has yielded a newfound closeness for her spellbound team, especially for Josef Svoboda, a recruiter for the Order of the Seven Stars. But Josef was bitten at the start of the war, leaving his blood tainted by a strain of the vlkodlak curse, which makes him a target of the Order's latest mission: slay the werewolves prowling the eastern front under the moonlight.

Petra refuses to give up on one of their own. From the hasty kill order of a clandestine society to the long-lost spells in an old grimoire to the unraveling mysteries of Petra's own past, the urgency to save Josef grows, particularly as his feral impulses become harder to control. The werewolves are closing in. So, too, are the bounty hunters eager to collect. As Petra's team finds itself at a magical crossroads, Josef devises an ambush of his own--one that could wipe out the cursed threat forever or endanger everything and everyone he loves.