Jim Butcher's The Dresden Files: War Cry — Jim Butcher

What do you do when you're outnumbered by scores of vampires and your only allies are three inexperienced wizards and some frightened scholars? If you're Harry Dresden...you attack! But even as Harry risks everything in an attempt to shatter the Red Court's defenses, a mystery threat prowls the nearby woods, ready to overturn the chessboard. Meanwhile, the supernatural WMD hidden in the Venatoris' underground chamber waits to be freed...