Tristan Satorin, the once fearsome Admiral of his Majesty's North Fleet, has accepted command of a private submersible venture on a mission to recover the treasures buried in the sunken Temple of the Oracle, on the deserted island of Delphia. When the floundering sub is swept into an underwater cave system, he quickly discovers that the island is far from deserted, and the beautiful woman sent to meet him has a mission of her own. Jia has never seen an outsider, much less a man. She has lived as a hunter and a guardian of the Oracle, her life spent fishing the reef and observing the ancient rituals of her culture. Like all of the Oracle 'psychic daughters', she expects to venture into the modern world and choose a temporary mate for the rite of procreation. She does not expect to have that mate chosen for her by the Oracle herself, or for him to appear in the island's watery caves as a broad-shouldered soul of war, still reeling from the tragedies of his past. As she pursues her sacred imperative, she realizes that Tristan is much more than the Oracle would have her believe, and that she desires not only the strength of his body, but his heart. To save his life, she will betray her own people. To save his soul, she will kindle his fierce passion and match it with her own.