I've thoroughly enjoyed every book in the Riley Jenson series so far, but Tempting Evil is officially my favourite now. Half-werewolf, half-vampire, Rily has gone undercover for the Directorate of Other Races in a high-risk plot to bring down Deshon Starr. Starr is responsible for a myriad of clones and dangerous lab-bred monsters that have been tormenting Riley and her friends since book one, Full Moon Rising.
Arthur ups the stakes in this book as Riley is thrown headfirst into Starr's twisted world, where women are forced to fight for Starr's entertainment, rape is an everyday occurance and the slightest trangression is punishable in horrific ways. She's surrounded by people she can't trust, all of whom have their own agendas, and her psychic powers are developing in new, sinister ways. Throw in some romantic tension between Riley and part-time lover Quinn the vampire, and you have a non-stop, explosive ride.
Unfortunately, two elements kept me from giving this book five stars. The first is the number of times the phrase "my hormones did an excited jig" cropped up. Although it's been established since book one that werewolves are sexually liberated, easily aroused creatures, I was so sick of reading that line or a variant on it that I could have happily slapped Riley and ordered her to a nunnery. The second is her relationship with Quinn. He's proven time and time again throughout the series that he cannot accept her werewolf lifestyle (read: promiscuity) and constantly spits all over her heritage. It seems wrong to me that an intelligent, strong woman like Riley would put up with his essentially racist attitude and insults.
Overlooking those points, this is a great book and, for me, a great antidote to the latest angst-filled Anita Blake books. Pick up the first two, Full Moon Rising and Kissing Sin, and enjoy. Just watch out for the dancing hormones.