Indigo Moon by Gill McKnight

The road trip from Hell is paved with good intentions. Hope Glassy and Godfrey Meyers are on a mercy mission. Their friend Isabelle has been attacked by a rogue werewolf and is in the throes of lycanthropic fever. With their respective partners out of town all Hope and Godfrey can do is get Isabelle to the safety of Little Dip and the Garoul clan before her sire comes to claim her. In a desperate race against time, with the hounds of hell snapping at their heels, can they save her--and does Isabelle want to be saved? Third in the Garoul series.