19th volume of the book series “Sfide e giochi matematici”, in 60 volumes, published between 2017 and 2018. studiogiochi wrote the presentations for the whole series.

Every puzzle is a little story, with very little known details. To answer the final question, you will have to think as a real investigator and analize all the clues, even the smaller ones, to finally uncover what they tell and – moreover – what they don’t tell. As Sherlock Holmes once said: “Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth”.