The Great War may be over, but brilliant scientist Billie McKennan continues the fight to be taken seriously. When a deliberate omission wins her a marine biologist position aboard an expedition funded by a wealthy eccentric, she quickly discovers she’s not the only one keeping secrets.

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The opulent Eurybia sets sail for the Gulf of California with a handful of well-to-do passengers and talented scientists on board. To Billie’s surprise, her ex-husband counts among them. The true mission of the voyage comes into question when a mysterious specimen is captured. And then science unexpectedly gives way to wild rumors and superstition.

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Soon, a sinister force takes hold of the vessel—and everyone on it. Billie must reconcile her beliefs with the reality of what she encounters in the vermilion sea. But how much is she willing to sacrifice in order to survive?