Atlantis Awakening by Alyssa Day

To rescue the world from an overwhelming evil, Poseidon's warriors have risen from Atlantis. Chief among them is Ven, serving as the King's Vengeance by birthright and by battle challenge. None can conquer him - except perhaps for one human female....

The Warrior...
Ven's mind is filled with duty. He must serve as Atlantean liaison to the humans in a war waged against the vampires. A sword is his weapon - not diplomacy. But on a mission to recover the Nereid's heart - a ruby of immense power - it will take every ounce of strength he possesses to resist the sexual allure of the beautiful witch chosen to work with him.

And the Witch...
Erin's heart is filled with vengeance. She lives only for the chance at revenge against those who murdered her family. Now she must partner with a legendary Atlantean warrior whose dark desire threatens to crash through the barriers built around her emotions - and her heart. Caught in the trap of shifting alliances, how long can Ven and Erin resist their awakening passion?

Dark forces beware: Atlantis is awakening

Atlantis Unleashed by 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 the eternal darkness...

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 evil that could destroy them both.

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...

Heart of Atlantis by Alyssa Day

As a war wages between the immortals of Atlantis and those of the vampire realm, a Poseidon warrior fights to save his world—and the woman he loves. And no risk is too great.

The desires of a high priest.
Alaric, Poseidon’s High Priest, has made a vow to Quinn, the woman he loves and the leader of the Resistance: to save her friend Jack before his last bit of humanity has been drained. Should Alaric succeed, there’s one intimate danger: he may lose Quinn to the love of the man whose life he saved. But damn Atlantis to the nine hells, he’s willing to put Quinn’s wishes first, regardless of the consequences.

The warning of a threat reborn.
The final jewel of Poseidon’s trident has turned up in the hands of mysterious Ptolemy Reborn, who claims to be descended from Atlantean royalty. He’s about to reveal to the world that Atlantis is real, positioning himself as king. But this magical terrorist is bent on chaos. The only warrior who can stop him is following his own path, driven by the even more powerful force of love. Atlantean powers over the sea could prove just as cataclysmic—for Quinn’s love, Alaric might drown the entire world.