After trailing spouse Marah Lenaerts suffers her third miscarriage in as many years, her husband Eden surprises her with a vacation to Malaysia, hoping it will lift her spirits. And it does, as they enjoy trading the bustle of their Shanghai life for the idyllic tropical paradise. But while on a diving excursion, they’re taken hostage by a group of terrorists, who take them to a remote island and hold them there for ransom. The longer that time drags on, though, the more doubts Marah begins to have about their captors’ true motivations.

Much like the book itself, the cover design presents a dark, atmospheric view into a cave system, commonly found in the region of Malaysia in which the book is set. In doing so, the cover offers a deep look into the anguish and despair experienced by the characters themselves: Marah had been struggling with depression, though she’d never admit it nor ask for help, while Eden orchestrated the entire kidnapping to get out of some insurmountable trading debts he’d incurred.