Callypso Lillis is a siren with a very big problem, one that stretches up her arm and far into her past. For the last seven years she’s been collecting a bracelet of black beads up her wrist, magical IOUs for favors she’s received. Only death or repayment will fulfill the obligations. Only then will the beads disappear. Everyone knows that if you need a favor, you go to the Bargainer to make it happen. He’s a man who can get you anything you want... at a price. And everyone knows that sooner or later he always collects. But for one of his clients, he’s never asked for repayment. Not until now. When Callie finds the fae king of the night in her room, a grin on his lips and a twinkle in his eye, she knows things are about to change. At first it’s just a chaste kiss—a single bead’s worth—and a promise for more. For the Bargainer, it’s more than just a matter of rekindling an old romance. Something is happening in the Otherworld. Fae warriors are going missing one by one. Only the women are returned, each in a glass casket, a child clutched to their breast. And then there are the whispers among the slaves, whispers of an evil that’s been awoken. If the Bargainer has any hope to save his people, he’ll need the help of the siren he spurned long ago. Only, his foe has a taste for exotic creatures, and Callie just happens to be one...

They came to earth—Pestilence, War, Famine, Death—four horsemen riding their screaming steeds, racing to the corners of the world. Four horsemen with the power to destroy all of humanity. They came to earth, and they came to end us all. When Pestilence comes for Sara Burn’s town, one thing is certain: everyone she knows and loves is marked for death. Unless, of course, the angelic-looking horseman is stopped, which is exactly what Sara has in mind when she shoots the unholy beast off his steed. Too bad no one told her Pestilence can’t be killed. Now the horseman, very much alive and very pissed off, has taken her prisoner, and he’s eager to make her suffer. Only, the longer she’s with him, the more uncertain she is about his true feelings towards her … and hers towards him. And now, well, Sara might still be able to save the world, but in order to do so, she'll have to sacrifice her heart in the process....