Naufraged on the planet Ythaq, the young officer Granite and technician Narvarth seek to save Callista, the passing sulfurous woman for whom they have responsibility. They do not know that she has usurped the identity of the terrible Margrave Ophyde and that she now seems to be leading the region. But what game is Dhokas, the cruel mercenary? It is at the center of the palaces of the Kreac'h lagoon that Narvarth and Callista will make surprising discoveries.Ythaq is a world where echoes of many mysteries resonate.