Riley Jenson, Guardian novels

When her twin brother, Rhoan, an assassin who protects the innocent from evil supernatural beings, vanishes, Riley Jenson--a young woman who is half werewolf, half vampire--joins forces with a sexy but disoriented vampire to find him.

"In a world of sorcery and seduction, the nights bring out the beautiful, the damned, and the desired. Here, Riley Jenson is on her own--half werewolf, half vampire, working for an organization created to police the supernatural races. Trusting her superiors and lovers barely more than she trusts her worst enemies, Riley plays by her own set of rules. Her latest mission: to enter the heavily guarded pleasure palace of a criminal named Deshon Starr--a...

Working for an organization that polices supernatural races, Riley Jenson--half werewolf, half vampire--is given the task of infiltrating the heavily guarded pleasure palace of Deshon Star, a criminal mastermind who has been experimenting with genetics for decades.

Guardian Riley Johnson always seems to face the worst villains. And this time's no different. For it's no ordinary sorceress who can raise the dead to do her killing. But that's exactly what Riley expects to find at the end of a trail of female corpses used--and discarded--in a bizarre ritual of evil. With pressure mounting to catch one fiend, another series of brutal slayings shocks the vampire world of her lover, Quinn. So the last thing Riley needs...

After her soul mate is killed, half-vampire, half-werewolf Riley Jenson takes on a new case that forces her to go up against an enemy from her past who is determined to strip Riley of everything that gives her life meaning.