"The Precious Book" by Heikki Välisalmi is an exciting crime detective story full of unexpected turns of events and mysterious characters. In the center of the plot is the disclosure of a crime that took place in a small Finnish town. The main character, detective Thomas Koivisto, begins to investigate this case and soon finds himself in mortal danger. Koivisto is forced to use all his skills and intelligence to get to the truth and save himself from the threat. "Precious Book" is tension, intrigue and an exciting plot that will keep you in suspense until the very end.