Dead as a Doornail — Charlaine Harris

Small-town cocktail waitress Sookie Stackhouse had more than her share of experience with the supernatural--but now it's really hitting close to home. When Sookie sees her brother Jason's eyes start to change, she knows he's about to turn into a werepanther for the first time--a transformation he embraces more readily than most shape-shifters she knows. But her concern becomes cold fear when a sniper sets his deadly sights on the local changeling population, and Jason's new panther brethren suspect he may be the shooter. Now, Sookie has until the next full moon to find out who's behind the attacks--unless the killer decides to find her first...