It's summer and the holidays in a cottage in the village of Shediac Bridge. The main activities in the program are to bask in sun bathing to make the beautiful beaches of the region and taste the famous shells fried Chez Leo. But when Gabriel learns of Shediac off an island called Ile-to-Skull, their holidays take an entirely different turn. According to what is said in the area, many human bones would have been found over the years, and, for reasons that remain nebulae. With the help of Roland, friendly marine tour operator to focus typically Acadian they manage to reach the island-au-Skull, where Gabriel will make a much more unexpected discovery and more wonderful than just bones. This incredible discovery could lead them to an ancient artifact of great value, but they are not the only ones who covet the treasure. Very clever one who can tell who the allies and who are the enemies of the Three Musketeers in this frantic adventure that takes the reader guessing until the end.