A rare hybrid of vampire and werewolf, Riley Jenson and her twin brother, Rhoan, work for Melbourne s Directorate of Other Races, an organisation created to police the supernatural races - and protect humans from their depredations. While Rhoan is an exalted guardian, aka assassin, Riley is merely an office worker - until her brother goes missing on one of his missions. The timing couldn t be worse. 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...

Luckily Riley has two willing partners to satisfy her every need. But she will have to control her urges if she s going to find her brother. For someone is doing some illegal cloning in an attempt to produce the ultimate warrior - by tapping into the genome of nonhumans like Rhoan. Now Riley knows just how dangerous the world is for her kind - and just how much it needs her.