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An expedition sets out from Fort King toward the Rocky Mountains. Among its members are two experienced mountaineers: the veteran Jerry Lachman and the wealthy businessman Norman Boswell, accompanied by Boswell’s three young nephews on their first climb. The group intends to scale the summit of Mount Leigh, an untouched giant of stone. For Lachman this is a second attempt: years earlier, on the same peak, while climbing together, his brother Sandy vanished under mysterious circumstances, and Jerry now hopes to find his body and reconstruct what happened. Zagor realizes, however, that someone is plotting against the expedition and sets out on the wagons’ trail together with Chico.

In fact, it is not only Indian arrows that threaten the expedition: it is clear that one of the members of the group is scheming against the others. But who? And why? Determined to solve the mystery, Zagor joins the mountaineers after they have been abandoned by their guides, and leads them toward the Rocky Mountains across vast prairies that are still largely unexplored.

Under Zagor’s guidance, the expedition finally reaches its destination at the foot of the stone giant. The climb begins in a gloomy and threatening atmosphere, like the clouds gathering around the summit. And as they reach the realm of eternal snow, with only a treacherous glacier separating them from the peak, the murderous hand of a traitor is ready to strike, while another unsettling threat seems to loom over the group: there are those who claim to have seen the ghost of a man who disappeared among the ice many years earlier, someone waiting in ambush for his brother, the only one who knows the tragic truth about what happened on that distant day…