One day fifteen-year-old Patrick discovers some mysterious footprints in the snowy mountain. Has the abominable snowman possibly returned? Also, who was the strange man Patrick met at the town hall? Patrick investigates to solve the mystery and save his town from a terrible catastrophe.

One day fifteen-year-old Carlos discovers some mysterious footprints in the snowy mountain. Has the abominable snowman possibly returned? Also, who was the strange man Carlos met at the town hall? Carlos investigates to solve the mystery and save his town from a terrible catastrophe.

Fourteen-year-old Thomas Laventure has been living for the last six months with his family in Nunavut, an Inuit-populated territory in northern Canada, searching for meteorites. One day, while building an igloo in the garden, he suddenly finds a mysterious, warm red stone...

In an underwater excavation site under the lake of Saint-Malo in Brittany, there is the theft of an 18th-century treasure chest. Chief suspects are an archeologist and a diver. Three cousins, Sophie, Gaël and Loïc, accompanied by their dog Surcouf, decide to investigate…