Theron - Dark haired, duty bound and deceptively deadly. He's the leader of the Argonauts, an elite group of guardians that defends the immortal realm from threats of the Underworld. From the moment he walked into the club, Casey knew this guy was different. Men like that just didn't exist in real life - silky shoulder-length hair, chest impossibly broad, and a predatory manner that just screamed dark and dangerous. He was looking for something. Her. She was the one. She had the mark. Casey had to die so his kind could live, and it was Theron's duty to bring her in. But even as a 200-year-old descendent of Hercules, he wasn't strong enough to resist....

Zander - the most feared of all the Eternal Guardians. It's rumored he can't be killed, and he always fights like he has nothing to lose. But as a descendant of the famed hero Achilles, he's got to have a vulnerability . . . somewhere. Forces of daemons are gathering and have broken through the barriers of the Underworld. Now more than ever the Eternal Guardians are needed to protect both their own realm and the humans.

TITUS - to most his gift seems like a blessing, but for him it's a curse the other Eternal Guardians-those who protect the mortal realm from threats of the Underworld-seek to exploit. One he would gladly trade for the chance to be free . . . Obsessed. Her touch is like a drug. From the moment he met her, Titus knew she was different. Even dangerous. Yet though his guardian brethren are convinced Natasa is working for Hades, Titus can't stop thinking about her. Can't stop fantasizing about her.

Nick, leader of the half-breeds and the last true hero, has spent his life fighting a dark pull toward the gods - a pull he now knows is linked to his father Krónos and the Titan's plan to escape from the Underworld. But Nick's hidden powers are coveted by more than just his father. Imprisoned by Hades, Nick battles every form of torture imaginable as the god schemes to break him. Only one thing keeps him sane - one woman who gives him the strength to fight the relentless darkness.

Ari - once an Eternal Guardian, now he's nothing but a rogue mercenary with one singular focus: revenge. His guardian brothers all think he's dead, but he is very much alive in the human realm, chipping away at Zeus' Sirens every chance he can, reveling in his brutality and anonymity. Until, that is, he abducts the wrong female and his identity is finally exposed. It will take more than the Eternal Guardians, more even than the gods to rein Ari in after everything he's done. It may just take the courage of one woman willing to stand up to a warrior who's become a savage.

Damon: For 25 years he's served as a plaything for the gods. With no memory of his past, he has no way of knowing if this is his ultimate fate, but he senses there has to be more to life. Damon's hope for more comes in the form of the Sirens' newest recruit. Elysia is unlike any trainee he's ever met. Not only can she remember where she came from - an ability the Sirens block - but she has an instant connection to Damon, one he's never before felt and doesn't understand. Soon Damon is willing to do anything to have Elysia. Even risk the wrath of the gods to break her out of Olympus.

Prometheus - one of the keenest Titans to ever walk the earth. Until, that is, his weakness for the human race resulted in his imprisonment. For thousands of years, Prometheus's only certainty was his daily torture at Zeus's hand. Now, unchained by the Eternal Guardians, he spends his days in solitude, trying to forget the past. He's vowed no allegiance in the war between mortal and immortal, but when a beautiful maiden seeks him out and begs for his help, he's once again powerless to say no.

Since the dawn of modern man, Erebus was Hades' secret weapon in the war between the immortal realms. Until Hades lost the minor god in a bet to his older brother Zeus. For the last 100 years, Erebus has trained Zeus's Siren warriors in warfare and the sexual arts. But he's never stopped longing for freedom. For a life filled with choice. And lately, he also longs for one Siren who entranced him during their steamy seduction sessions. A nymph he quickly became obsessed with and who was ripped from his grasp when her seduction training was complete.

For thousands of years, Ryder has reveled in his role as an immortal messenger - a dream weaver sent to seduce and manipulate. Until he’s ordered to deceive a fantasy of his own. Zakara, the daughter of one of the mightiest Eternal Guardians, is his perfect woman. But she’s impervious to Ryder’s advances. Each attempt to sway her to his will pushes him deeper into a dreamscape she seems to be controlling. To survive, Ryder will need to find a way to master his sexy new prey.