Grande ourse: La clé des possibles

Despite himself, Louis-Bernard Lapointe can't escape the fact that he is a sorcerer. To save the life of his only friend, Biron, Lapointe must find "the key of possibility" that will give him entry to the parallel worlds. In order to find the key, he must cast himself into one of the possible worlds and solve an riddle, a process that will cause him to reflect upon the choices that define each human being and that make us decide who will live and who will die.