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The famous detective Fuagre and his faithful assistant, Josephine the dog, together with curious readers, will solve the stunning case of the ruby cup theft, the secret of which lies in the ancient French legend of the miracle elixir that gives success.

In the company of a mysterious hacker, Foigre and Josephine will expose an elusive shape-shifting thief and unravel all his insidious plans. The book will be a real find for children of primary and secondary school age, as the characters of this story will not only help develop logical thinking, but also prove that friendship overcomes any obstacles.