Silver-Tongued Devil: Sabina Kane: Book 4 by Jaye Wells
Life is looking up for Sabina Kane. The threat of war between the dark races seems to have passed, and her magic training is also progressing well - just like her relationship with the sexy mage Adam Lazarus. But as much as Sabina feels hopeful about the future, she doesn't quite trust that peace is possible . . .
Her suspicions are confirmed when a string of sadistic murders threaten to stall peace talks between the vampires and the mages. Sabina pitches in to find the killer, but this dark investigation soon has her questioning everyone she thought she could trust. And the closer she gets to the killer, the more Sabina begins to suspect this is one foe she may not be able to kill.