Cico is attacked by a young Fox, little more than a teenager. Zagor stops him and takes him back to his camp, where the tribal chief apologizes and offers him a sumptuous dinner.
However, Zagor hears moans from a hut, and understands that the Foxes have something to hide: he therefore leaves the camp. He returns at night and manages to free the prisoner: it is Doctor Jim Galloway, kidnapped by the Foxes to treat a typhus epidemic.
Pursued by the Foxes, the three take refuge at the top of a hill, where Zagor puts up a strenuous resistance. The doctor, however, realizes that he wants to help the Indian tribes voluntarily, and therefore stays with them, putting an end to the fight.
