For eons, the city of Troy—whose legendary fall was detailed in Homer's Iliad—was believed to be myth, until archaeologists in the nineteenth century uncovered its ancient walls buried beneath the sands. If Troy was real, how much of Homer's twin tales of gods and monsters, curses and miracles—The Iliad and The Odyssey—could also be true and awaiting discovery?

In the frozen tundra of Greenland, a group of modern-day climatologists and archaeologists stumble on a shocking find: a medieval ship buried a half mile below the ice. The ship's hold contains a collection of even older artifacts—tools of...