Riley is an engaging and interesting character, and Arthur's world -- in which vampires and werewolves live parallel lives with mundane humans -- is fascinating. This novel is fast-paced and briskly written. Although the plot is slight at times, there is more than enough momentum to carry it along. The sex scenes crackle with tension, and Riley's relationship with the enigmatic and charming vampire Quinn is a highlight.

Riley Jensen and her twin brother, Rhoan, are werewolf-vampire hybrids, cast out from their pack and left to fend for themselves. They both work for Melbourne's Directorate of Other Races, an organization that polices the supernatural races and protects humanity from their excesses. When Rhoan disappears during a mission, Riley begins a frantic search for him -- at the time that she is most vulnerable to the cycle of the moon. (Feb., 291 pp., $15.00)

Reviewed by: 
Natalie A. Luhrs