A rare hybrid of vampire and werewolf, Riley Jenson works for Melbourne's Directorate of Other Races, an organisation created to police the supernatural races - and protect humans from their depredations. More werewolf than vampire, Riley is vulnerable to the moon heat, the weeklong period before the full moon, when her need to mate becomes all-consuming. But that's the least of her worries. Evil is on the rampage in Melbourne and it's up to her to stop it...
In the ninth and final entry in Arthur's deservedly popular Guardian series (after 2009's Bound to Shadows), a strong start and a terrific ending are poorly served by a disjointed middle. As series heroine Riley Jensen, a part-vampire/part-werewolf investigator, tries to find the perpetrator of a series of ritualistic murders, she must cope with her ever-changing biology and the knowledge that she killed her soul mate. She begins to contemplate leaving her job and shacking up with Quinn, her centuries-old vampire lover. Then a longstanding enemy destroys Quinn's car with Quinn in it and Riley's world goes black. She awakens with amnesia and struggles to regain her identity in a lengthy section that reads like an excerpt from a different book and leaves little room for resolving the series, a decision that will sorely disappoint Arthur's fans.