Atlantis Unleashed — Alyssa Day

Eleven thousand years ago, Poseidon's warriors swore an oath to protect humanity from those who stalked the night. Now those powerful forces are uniting. So are two souls who are all that stand between justice and eternal darkness...

A warrior prince...
Lord Justice made the ultimate sacrifice for his brother and paid for it with unimaginable torture. Now he's back, rescued from death, his sanity shaken, and his mission inescapable: to search for the lost star of Artemis. But the beautiful human female whom he has sworn to protect is shadowed by an it that could destroy them both.

A woman of science..
The archaeological artifacts of Atlantis speak to Dr. Keely McDermott, sharing visions of life long ago. The ancient revelations have cast her into a world between past and present, between reality and illusion -- and, when she meets the fierce Atlantean warrior assigned to guard her, between terror and temptation. As their two worlds collide, so too will danger and desire...