The Roman Conspiracy
(1991)(A book in the Asterix adventure games series)
A non fiction book by Goscinny and Uderzo
Justforkix's own father, Doublehelix, is accused of being involved in the forgery of the menhirs that are flooding the souvenir market. Justforkix sets out to solve the case and it is up to the reader to make sure that he finds the true identity of the forgers.
Used availability for Goscinny's The Roman Conspiracy