When darkness falls, a new guardian emerges. Katerina Dubova has always aspired to walk in her father's footsteps as a respected journalist, and the Second World War presents a unique opportunity for her to prove her worth to the world. A tip about an assassination attempt on a high-ranking Nazi official, Reinhard Heydrich, the "Butcher of Prague" leads Katerina into the shadows of the Nazi occupation. Soon she discovers things are not as they seem.

As intrigue unfurls, Katerina joins forces with Josef Loew, a descendant of the famous Rabbi Loew, renowned for creating a mystical guardian in the form of a golem to protect the souls of 16th-century Jews in Prague. In the chaos of war, some believe a new golem can once again bring help to those in need.

Like flickering candles in the abyss, Katerina and Josef work to protect the innocent and end the evil that plagues their world. Yet, in their quest to save the Jewish people, have they inadvertently created a new danger? Could the very entity they had forged to protect become their greatest enemy?