Aboard a long-range research vessel, in the vast reaches of the South Pacific, the cast and crew of the reality show Sealife believe they have found a ratings bonanza. For a director dying for drama, a distress call from Henders Island—a mere blip on any radar—might be just the ticket. Until the first scientist sets foot on Henders—and the ultimate test of survival begins.

For when they reach the island’s shores, the scientists are utterly unprepared for what they find—creatures unlike any ever recorded in natural history. This is not a lost world frozen in time; this is Earth as it might have looked after evolving on a separate path for half a billion years—a fragment of a lost continent, with an ecosystem that could topple ours like a house of cards.