The Hidatsa tribe chooses a new chief between two rivals. According to an old tribal custom, rivals compete in a game with seven arrows, but one of them is wounded, so Zagor takes his place.
Robert Gray returns after many years to take revenge on all those who cost him his military career. Just like last time, Zagor stands in his way; and he is once again the only one who will be able to stop the Alchemist's bloody and vengeful campaign!
A mysterious dream forces Zagor to travel to an Indian village on the Atlantic coast, to meet with a young sorcerer, also troubled by anxious prophecies... It seems that Stephan, a priest of the dark cult of the demon Haggoth, has returned...