Susan Krinard 
Twilight Crossing [EPUB ebook] 

Bound by blood, sealed in secrets A half-blood Rider, Timon has a duty to anyone under his protection, but his intense attraction to scientist Jamie Mc Cullough is complicating his latest mission. In a moment of desperation, he makes a difficult choice. His bite heals her-and creates a bond that neither of them can resist.As Jamie heads for a conclave convened to create new peace between humans and vampires, she carries a secret that could secure peace everlasting. But before she has a chance to reveal it, she’s accused of bringing a vampire-killing virus to the negotiations. While Timon is willing to pay the ultimate price to save her, can he first win the ultimate challenge of her trust?