An aeronautical engineer at Ariane Espace, Jim has devoted himself for years to a secret project: building his own rocket and accomplishing the first manned space flight as an amateur. But to realize his dream, he must learn to share it.

In France, the single translator Diane Siprien adopts an Asian baby named Liu-San in a foundation directed by Sybille Weber. Years later, a weird mark appears on the boy's chest and Diane and Liu share their dreadful nightmares. Diane is assigned for a three-day job in Germany and she leaves Liu with her friend Sybille. However, while going to the airport, Diane finds Liu hidden in the backseat and startles with an eagle flying toward the windshield, crashing her car. Liu falls into a coma and his digital recorder records the boy speaking in an unknown dialect. When Diane searches the translation and the origins of Liu, she is surrounded by mysterious murders. She discovers that the dialect is from the mystic Mongolian Tseven tribe and that Liu is a powerful Observer; further, he is in danger, threatened by sorcerers that need the boy for their Council of the Stone..

In 18th century France, the Chevalier de Fronsac and his Native American friend Mani are sent by the King to the Gevaudan province to investigate the killings of hundreds by a mysterious beast.