"Kalkarokärme" by Kurt Lange is an exciting thriller that tells about the unusual case of the theft of the famous princely ruby treasure. The main character, an experienced detective, goes in search of jewels and finds himself in the very heart of a dangerous, intriguing society. Crimes, secrets and danger intertwine on the hero's path, revealing to him secrets that threaten not only his life, but also fragments of age-old secrets. "Kalkarokyarme" is a tense book that will not let you rest until the last page.