(1999)
A Muslim ambassador exiled from his homeland joins a group of Vikings, initially offended by their behavior but growing to respect them. As they travel together, they learn of a legendary evil closing in and must unite to confront this formidable force.
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by Michael Crichton
It is 922 A.D. The refined Arab courtier Ibn Fadlan is accompanying a party of Viking warriors back to the north. Fadlan belatedly discovers that his job is to combat the terrors in the night that come to slaughter the Vikings--but just how he will do it, Fadlan has no idea....