Congo / Sphere / Eaters Of The Dead by Michael Crichton

A trio of fast-paced adventures: one follows an expedition into the African jungle to recover lost technology and study unexpectedly intelligent apes amid corporate intrigue and deadly obstacles; another centers on scientists and military personnel investigating a crashed alien ship on the ocean floor who confront a mysterious, reality-bending sphere that manifests their deepest fears; the third is a fictionalized medieval travelogue in which an outsider joins Norse warriors on a voyage to battle terrifying, cannibalistic foes, blending historical detail with brutal action and mythic themes.

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