Strindberg's Star by Jan Wallentin

When a mysterious artifact connected to a long-lost Nazi secret surfaces in modern-day Europe, a series of murders and international conspiracies begin to unfold. Archaeologist Don Titelman and intelligence officer Eva Strand are drawn into a dangerous search that stretches from the Arctic to the heart of Europe. As they uncover clues tied to ancient myths, scientific mysteries, and wartime secrets, they must race against powerful forces willing to kill to possess the artifact's hidden power.